looking for a better definition than strength + energy

+agility + stamina

1.
physically active and strong; good at athletics or sports: an athletic child.
2.
of, like, or befitting an athlete.
3.
of or pertaining to athletes; involving the use of physical skills or capabilities, as strength, agility, or stamina: athletic sports; athletic training.

athleting rly hard

I would say ones natural athletic potential - hand/eye coordination, build, stength

its an athlete with zooom zooom zoooom

Having the same boring schedule for years

athlet - zoooom zooom zooom

This but athleting even harder

when i think of natural athleticism, it usually comes down to acute proprioceptive and psychomotor abilities

if you are well attuned to your movements, position in space, and can "tell" your body when and where to move, you can be very athletic