First , determine what kind of physical ability that you excel at and what is your physical weakness
for example, you're very agile but you have no strength.
Second, you determine what kind of sports that required a physical aspect that matched yours
For example, Football need agile athletes for certain positions
Third, analyze what can you do in that sport with your physical ability
Since you're agile but you got no strength, you are useless on the defensive line, but you can be really useful as a Runningback
Last, prepare a training regime that you will need to do in order to fulfill your role in that spport
for example, cardio conditioning on Monday- Wednesday, sprint training on Thursday, etc
Cell, Tissues, Organs, Organ Systems, Organism (Multicellular).
This is from the smallest component to largest components that make up a human organism.
The cycle is called Yo-Yo dieting.
He should increase the speed in which he runs as the faster one runs the faster their heartbeat.