What we are speaking of is your "relative strength." This is the strength of your body in relationship to the weight of your body and gravity.
You need to increase your relative strength to the point that strength doesn't slow the contraction speed of your muscle.
In short, for 99% of athletes I train reducing body fat will result in some increase in vertical leap.
Without comprehensive assessments (and even with) it is difficult to precise exactly how much of an increase will be realized by the weight loss (or strength gain).
For example and extremely strong athlete who has more than enough strength to overcome their body weight will gain little to nothing from additional strength or weight loss. Plyometric ability, central nervous system functioning enhancement, and form improvements will result in greater gains.
On the other hand someone with very little strength and who does not have enough strength to overcome bodyweight and gravity will benefit much more from weight loss and strength gains. Typically this person will also benefit much from plyometric ability, central nervous system enhancements, and form improvements.
Regardless of the above, unless you have a good reason to retain excess weight (as in the case of a football player or post player etc), it is beneficial to reduce excess fat. This will typically increase performance, AND reduce impact on our precious joints!
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