Why Athletes Should Get Jacked


  1. Muscle mass is correlated to both strength and sprinting performance
  2. Strength is limited by muscle size
  3. Training for muscle size can enhance gains in power (phase potentiation)

Disclaimer: This article is for power (explosive) athletes – not endurance athletes.  With these power-athletes, they should only train muscles to get jacked if they later need them to be strong and explosive (e.g. glutes in sprinting, and quadriceps in jumping).

The Misconception of Bodybuilding

Jacked. adjective: (of a person) having very well-developed muscles.

People hate bodybuilding.  They hate it because they know nothing about it.

Train for a couple years, put on 20 pounds of muscle, and everyone loses their minds.

You eat too much protein, you’re trashing your muscles, you’re hurting your kidneys and liver.

Let’s say you take those same couple of years, let yourself go, and gain 20 pounds of fat.  No one would bat an eye!

You could go run half marathons and everyone would be at peace.

But decide to get jacked and everyone gets offended.

This is how the general public is towards gaining muscle – confused.  And because they’re confused, they’re scared.

I have the same experience with athletes who seek gains in explosiveness (e.g. jumping, sprinting, throwing, hitting, and changing direction). They don’t understand size, so they fear it.

When training these athletes, a primary goal is to increase power output. If I can get them displaying more force in a shorter time (more power) – all things being equal – they will be a better athlete.

We work the strength side of power by training heavy – they understand the need for this.

We work the speed side of power by training fast – they understand the need for this as well.

But if we work to increase muscle size, everyone freaks out!

I don’t want to get too big, more size will slow me down, training to get big is useless.

So what’s the deal?  Are athletes actually right to avoid size gains?  Or can it actually benefit them?

First of all, there is some correlation evidence that size helps both strength and power:

Strength: More muscular Powerlifters are more successful than less muscular counterparts [2, 14, 32].

Takeaway: Power = Strength x Speed.  More muscle may help with the Strength component of Power.

Power: Shorter distance sprinters generally have significantly more muscle mass than longer distance runners [30].  Leg muscle volume is significantly correlated with maximal running velocity [4].  The main factor for differences in gender in peak and mean power output during a Wingate cycling test (which is correlated with short-distance sprinting [18, 21]) is the muscle mass of the lower extremities [22].

Takeaway: Muscle mass correlates to the high power activity of sprinting, perhaps because sprinting requires high amounts of force [31].  And since sprinting is related to change of direction ability [3, 6, 23, 28], muscle may also help to increase performance in that regard.

So again, what’s the deal?  Why does more muscle mass correlate to strength and power?

Why Size Benefits Strength

There are factors of strength:
Individual differences
Central nervous system factors and
Muscular factors [1, 8, 12, 20, 34]

The muscular factor of focus here is hypertrophy.  Hypertrophy is defined as an increase in the size of muscle fibers.  On the whole, this causes an increase in cross-sectional area (CSA) of the muscle.  Generate a lot of hypertrophy (increase CSA) and this gives the look of being jacked.

Muscle strength and cross-sectional area are significantly positively correlated [17].  CSA strongly predicts strength in the forearm [29], upper arm [9, 24], knee extensors [16, 24, 29], and distinguishes strength differences among trained and untrained individuals [15].

So here’s the deal: Size limits strength. There are many ways to get stronger, but to see long-term gains, you simply must grow. Getting your muscles bigger serves to increase you potential for strength. And in the quest for maximal power – jumping high, sprinting fast, and being explosive – strength is imperative to develop.

Get Jacked First

People much smarter than me have established a system that optimizes power development.

Gregory Haff et al. recommends the concept of phase potentiation.  This is where the adaptations from one phase of training serve as the foundation for the next phase.  They are:

1) Increase muscle cross-sectional area 2) Increase muscular strength and 3) Maximize power development [10].

Evidence to support this come from DeWeese et al. who reviewed the literature and mathematical modeling of Minetti et al. [19] and Zamparo et al. [33].  They propose the same type of training plan:

1) Increase cross-sectional area (CSA) – or hypertrophy 2) Increase in central effects of force production and 3) Develop additional nervous system effects through power training [7].

Both of these recommendations tell us this:  First, get jacked.  Then get strong.  Then get powerful.

With the concept of phase potentiation, we can say this: Size is potential Strength and Strength is potential Power.

Increase size and you have more raw material (muscle) to turn into strength.

Increase strength and you are able to use heavier loads with power training (which is typically done at 30-60% load [5, 11].

Phase potentiation – This is why I train athletes to increase muscle mass.  So that they can be more powerful than ever possible had they not added size.

How to Get Jacked

Muscle hypertrophy results from the interplay between mechanical tension and metabolic stress [25].  Lifting extremely heavy (1-5 rep max) causes high mechanical tension, but low metabolic stress.  Lifting very light (20+ rep max) causes high metabolic stress but little mechanical tension.  Although you can get jacked using only heavy weight [27], you’ll get more high quality work done in less time training in the 6-12 rep range (where mechanical tension and metabolic stress are balanced).  Also, the high volume required to induce significant hypertrophy [13] will be too taxing to get from only heavy work.  To get the most gains, you must keep quality of effort high, which may mean longer rest periods [26].

My general recommendation is this: Give yourself enough time.  It can take months to get significant size gains.  Therefore, get jacked in the early off-season (gaining 1-2 lbs. per week) so it can be transferred to strength and power later.  And if you want to train muscle size more often, do it when it won’t interfere with more demanding strength or power work (at the end of the week or workout).

Size is not the enemy for power-athletes.  Done properly and in a timely fashion, getting jacked can take your strength and explosiveness to new levels.  Not to mention it makes you look like a beast.  Experiment with Hypertrophy Cluster-type training and Paired Set Training to maintain velocity and save time while trying to add muscle.

Caveat: This article addressed size in relation to power.  Size in relation to endurance deserves its own article.  There are detriments to adding size without maintaining your conditioning.  Play and practice your sport throughout a mass phase and you will negate many of the negative effects.

Share this on Facebook & Join the Conversation

I’ve always been a hard gainer.  I’ve never weighed more than 153lbs even though I’m a hockey player.  I’ve tried so many times to gain weight, in and out of the gym.  I’ve only been on your program (Hypertrophy Clusters) for 2.5 weeks and I’m already up to 155lbs.  Also I was SUPER weak maxing out my front squat at 135lbs, but now I’m front squatting 225.  I’m playing club hockey next season and wanted to get bigger, and in better shape.  After all my failure at gaining weight I’m trying one more time, and I’m already seeing results, and it’s only been 2.5 weeks.

Matt M. - Hockey Player


[1] Bompa, T. & Haff, G. G. (2009). Periodization: Theory and Methodology of Training (3rd Ed.). Human Kinetics.

[2] Brechue, W. F. & Abe, T. (2002). The role of FFM accumulation and skeletal muscle architecture in powerlifting performance. European Journal of Applied Science, 86(4), 327-36.

[3] Brooks, K. A., Clark, S. L., & Dawes, J. J. (2013). Isokinetic Strength and Performance in Collegiate Women’s Soccer. Journal of Novel Physiotherapies, Suppl 3, 001–. http://doi.org/10.4172/2165-7025.S3-001.

[4] Chelly, S. M. & Denis, C. (2001) Leg power and hopping stiffness: relationship with sprint running performance. Medicine and Science in Sports and Science, 33(2), 326-33.

[5] Cormie, P., McCaulley, G. O., Triplett, N. T., & McBrdige, J. M. (2007). Optimal loading for maximal power output during lower-body resistance exercises. Medicine and Science in Sports and Exercise, 39(2), 340-9.

[6] Delaney, J. A., Scott, T. J., Ballard, D. A., Duthie, G. M., Hickmans, J. A., Lockie, R. G., & Dascombe, B. J. (2015). Contributing factors to change-of-direction ability in professional rugby league players. Journal of Strength and Conditioning Research, 29(10), 2688-96.

[7] DeWeese, B. H., Hornsby, G., Stone, M., & Stone, M. H. (2015). The training process: Planning for strength-power training in track and field. Part 2: Practical and applied aspects. Journal of Sport and Health Science, 4(4), 318-24.

[8] Ema, R., Akagi, R., Wakahara, T., & Kawakami, Y. (2016). Training-induced changes in architecture of human skeletal muscles: Current evidence and unresolved issues. The Journal of Sports Medicine and Physical Fitness, 5(1), 37-46.

[9] Erskine, R. M., Fletcher, G., & Folland, J. P. (2014). The contribution of muscle hypertrophy to strength changes following resistance training. European Journal of Applied Physiology, 114(6), 1239-49.

[10] Haff, G. G. & Nimphius, S. (2012). Training principles for power. Strength and Conditioning Journal, 34(6), 2-12.

[11] Jandacka, D. & Uchytil, J. (2011). Optimal load maximizes the mean mechanical power output during upper extremity exercise in highly trained soccer players. Journal of Strength and Conditioning Research, 25(10), 2764-72.

[12] Jansson, E., Esbjörnsson, M., Holm, I., & Jacobs, I. (1990). Increase in the proportion of fast-twitch muscle fibres by sprint training in males. Acta Physiologica Scandinavica, 140(3), 359-63.

[13] Krieger, J. W. (2010). Single vs. multiple sets of resistance exercise for muscle hypertrophy: a meta-analysis. Journal of Strength and Conditioning Research, 24(4), 1150-9.

[14] Lovera, M. & Keogh, J. (2015). Anthropometric profile of powerlifters: differences as a function of bodyweight class and competitive success. The Journal of Sports Medicine and Physical Fitness, 55(5), 478-87.

[15] Maughan, R. J., Watson, J. S., & Weir, J. (1983). Muscle strength and cross-sectional area in man: a comparison of strength-trained and untrained subjects. British Journal of Sports Medicine, 18(3), 149-157.

[16] Maughan, R. J., Watson, J. S., & Weir, J. (1983). Relationship between the muscle strength and muscle cross-sectional area in male sprinters and endurance runners. European Journal of Applied Physiology and Occupational Physiology, 50(3), 309-18.

[17] Maughan, R. J., Watson, J. S., & Weir, J. (1983). Strength and cross-sectional area of human skeletal muscle. The Journal of Physiology, 338, 37-49.

[18] Meckel, Y., Atterbom, H., Grodjinovsky, A., Ben-Sira, D., & Rotstein, A. (1995). Physiological characteristics of female 100 metre sprinters of different performance levels. The Journal of Sports Medicine and Physical Fitness, 35(3), 169-75.

[19] Minetti, A. E. (2002). On the mechanical power of joint extensions as affected by the change in muscle force (or cross-sectional area), ceteris paribus. European Journal of Applied Physiology, 86(4), 363-9.

[20] Moritani, T. & deVries, H. A. (1979). Neural factors versus hypertrophy in the time course of muscle strength gains. American Journal of Physical Medicine, 58(3), 115-30.

[21] Nesser, T. W., Latin, R. W., Berg, K., & Prentice, E. (1996) Physiological determinants of 40-meter sprint performance in young male athletes. The Journal of Strength and Conditioning Research, 10(4), 263-7.

[22] Perez-Gomez, J., Rodriguez, G. V., Ignacio, A., Olmedillas, H., Chavarren, J., González-Henriquez, J. J., Dorado, C., & Calbet, J. A. (2008). Role of muscle mass on sprint performance: gender differences? European Journal of Applied Physiology, 102(6), 685-94.

[23] Peterson, M. D., Alvar, B. A., & Rhea, M. R. (2006). The contribution of maximal force production to explosive movement among young collegiate athletes. The Journal of Strength & Conditioning Research, 20(4), 867-73.

[24] Schnatz, P., Randall-Fox, E., Hutchison, W., Tydén, A., & Astrand, P. O. (1983). Muscle fibre type distribution, muscle cross-sectional area and maximal voluntary strength in humans. Acta Physiologica Scandinavica, 117(2), 219-26.

[25] Schoenfeld, B. J. (2010). The mechanisms of muscle hypertrophy and their application to resistance training. Journal of Strength and Conditioning Research, 24(10), 2857-72.

[26] Schoenfeld, B. J., Pope, Z. K., Benik, F. M., Hester, G. M., Sellers, J., Nooner, J. L., Schnaiter, J. A., Bond-Williams, K. E., Carter, A. S., Ross, C. L., Just, B. L., Henselmans, M., & Krieger, J. W. (2015). Longer inter-set rest periods enhance muscle strength and hypertrophy in resistance-trained men. Journal of Strength and Conditioning Research, 20.

[27] Schoenfeld, B. J., Ratamess, N. A., Peterson, M. D., Contreras, B. Sonmez, G. T., & Alvar, B. A. (2014). Effects of different volume-equated resistance training loading strategies on muscular adaptations in well-trained men. Journal of Strength and Conditioning Research, 28(10), 2909-18.

[28] Spiteri, T., Newton, R. U., Binetti, M., Hart, N. H., Sheppard, J. M., & Nimphius, S. (2015). Mechanical determinants of faster change of direction and agility performance in female basketball athletes. Journal of Strength and Conditioning Research, 29(8), 2205-14.

[29] Weeks, B. K., Gerrits, T. A., Horan, S. A., & Beck, B. R. (2016). Muscle size not density predicts variance in muscle strength and neuromuscular performance in healthy adult men and women. Journal of Strength and Conditioning Research, 30(6), 1577-84.

[30] Weyand, P. G. & Davis J. A. (2005). Running performance has a structural basis. The Journal of Experimental Biology, 208(14), 2625-31.

[31] Weyand, P. G., Sternlight, D. B., Bellizzi, M. J., & Wright S. (2000). Faster top running speeds are achieved with greater ground forces not more rapid leg movements. The Journal of Applied Physiology, 89(5), 1991-9.

[32] Ye, X., Loenneke, J. P., Fahs, C. A., Rossow, L. M., Thiebaud, R. S., Kim, D., Bemben, M. G., & Abe, T. (2013). Relationship between lifting performance and skeletal muscle mass in elite powerlifters. The Journal of Sports Medicine and Physical Fitness, 53(4), 409-14.

[33] Zamparo, P., Minetti, A. E., & di Prampero, P. E. (2002). Interplay among the changes of muscle strength, cross-sectional area and maximal explosive power: theory and facts. European Journal of Applied Physiology, 88(3), 193-202.

[34] Zatsiorsky, V. M. & Kraemer, W. J. (2006). Science and Practice of Strength Training (2nd Ed.). Human Kinetics.