The rear delts usually get neglected, but this is a pretty easy fix and one you can do at home on a daily basis. The band pull-apart will bring your sad little finger-sized rear delts up to snuff quickly.
You don't need a heavy-duty resistance band because you're going to keep the reps high. Rock bottom rep range is 20, done for 4-5 sets daily.
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Tip: Auto-Regulate Your Rest Periods
A new study on rest between sets may change the way you train, especially if your goal is hypertrophy. Check this out.
The Reactive Warm-up
Forget those long warm-ups that have you break-dancing across the gym floor. Here's something short and effective.
Tip: The Star Pattern Pull-Apart
Add these to your warm-up: 2-3 sets, 4-6 reps in each direction before any upper body training. Your shoulders will feel great.
Partial Overhead Press
Some call it the ultimate triceps movement, others call it, "that exercise that hurts the top of my head and makes me see birdies." Either way, you ought to be doing Partial Overhead Presses.