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I am not sure if I understand how forces work during hammerthrow. From my understanding athlete works with Fmuscle force on a ball and rotate it and a ball works with equal opposite force on an athlete causing rotation in a opposite direction. The mass of athlete is greater than the mass of ball so athlete rotates with ball in 1 direction(Fmuscle direction). Does it mean if ball would be heavier(more massive) than athlete, the athlete could not rotate it(even if strong enough to move it) ?

Do you know what reaction force is?

(I will use abstract approximate 1 dimension positions for example) I mean let's say I stay at position x=0, now I move my arm forward(positive value change), my arm is at position x=5 any my body is still at position x=0 cause friction of my body and ground is much greater than my body movement backward (caused by moving arm forward). Now let's say my arm weight 100x more than the rest of my body(it is just example), when I try to move my arm forward will instead my body be at position like x=-5(backward movement) and my arm like x=0 (or a very small positive value) ? (It seems a bit strange - I based it on understanding that less massive part moves much more than more massive) It seems strange because - let's say I weight 100kg and I keep 300kg in my hands(In this example I am very very strong) when I move my arms forward my body gets more backward movement than my arms forward resulting in - instead of just moving my arms I move away from my arms