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[Decalies]

Weightlifting: with joystick move it around in every direction as fast as possible. With the keyboard, this was the one I couldn't succeed at all.
Skipping-rope: press right and left button (that's what I did) quite fast in a very regular pace. Keep that up for - I don't know - tens of seconds or so. Here I got at least some increase in my stat. But I couldn't succeed fully either.

Hope this is clear enough! Enjoy the game further!

@ Office_Monk:
Several other websites mentioned that the two titles were the same. If not, I stand corrected.