I say to my friend:
I did 60 push ups, 50 sit ups, 15 pull ups in 1.5 minutes for each exercise.
Is the above sentence okay?
I'm trying to say I did had 1.5 minutes for each exercise and that's how many I did.
"In" is wrong in that context. If you say you did all those exercises "in" 1.5 minutes, it means that was the total time you took to do all 125 exercises.
I did 60 push ups, 50 sit ups and 15 pull ups. I took a minute and a half to do each set.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.