Question

An athlete does one push-up period in the process, she moves half of her body weight, 250 N, a distance of 20 cm, this distance is the distance her gravity moves when she fully extend her arms how much work did you do after one push-up

Answer 1

In the push-up, the athlete's weight  (or force) of 250 N moves through a distance of 20 cm.

By definition,
Work = force * distance.

Therefore, work done in one push-up is
$W=(250 \, N)*(20 \, cm)*(10^{-2} \, \frac{cm}{m}) = 50 \, J$

Note that 1 J = 1  N-m.

Answer:  1 J