@wellandfit It really depends on how much M&Ms, cheetos, lays, and rainbow sour strips you're eating currently.
20 pushups of your 145 pound body before bed aint going to do anything. 100 hundered crunches aint going to do much, and 40 seconds of jumping jacks is not going to anything noticeable. You could do all of this in less than 5 minutes, and you might have trouble getting to sleep if you're doing them right before bed, which might have an effect on your muscle repair.
Do you think working out for 5 minutes a day is going to make any major changes in your appearance?
However, I respect your desire to improve yourself. Do these exercises instead, explosive (fast on the way up) pushups 5 sets of 10-15, pull ups to failure 3 sets, slow pushups or pushups with 5 second holds at the bottom 4 sets, 8-10 30 yard sprints up hill, burpees for 60 seconds with 120 sec rest for 4 sets.