Kathryn, do you remember the Cuban Press? You place your arms in a scarecrow like position then flip your arms up and do a military press? I was wondering if that might cause some shoulder strain. Also, the shoulder exercise that's similar to a cable machine. It's like a front raise, only you lift on an angle. The shoulder work in general is high rep/low weight. I'm thinking of doing a two month rotation of BBC and I'm wondering if I should sub other shoulder workouts now and then. I don't have shoulder problems, but I don't want to cause any from overuse either!
The only exercise that I have to modify, so far, is the standing oblique work, when you move side to side at mach ten. I know my lower back couldn't handle the fast pace so I slow it down. Also, most of the ab work strains my lower back and I don't like doing it on the step, so I use either my stability ball or a mat.