We just got a workout video that breaks up workouts like you have Tigerlily. There is a 15 min arm, 15 core, & 15 leg workouts. At the moment we have a roatating schedule planned that goes something like Day 1: arms & core Day 2: core & legs Day 3: legs & arms & then repeat. Should be interesting to see how it works. We can't keep up with the whole routines yet, but we try.
The arm routine is a lot of tricep, chest, shoulder, upper back, & even more triceps.