I need some help with my exercise?

I'm like 5'10 or 5'11 and weigh about 136lbs, I do 60 push-ups, 3 mins of butterflies(via total gym on its highest level), 60 pull ups to workout my trapezius with 20lb dumbbells, then about 60 curves with a 25lbder, after that I work on my lower body by doing 60 leg raises and sometimes I may do some sit-ups(50-60)after that. But they seem to not, you know "stick" so my question is how to make the muscles ''stick". I have long work hours so I try to get in what I can. I tend to workout on average about 4 to 5 days out of a week, most of time i only do half of these exercise because of time. So any tips anybody?