well when I do mobility drills as my warmup before lifting I usually will do 10-12 reps, but only with one set. My routine done as a circuit usually takes about 10-12 minutes.
On my off days from lifting I usally do 1-2 "circuits" of my routine and some abdominal stabilization work, and I may even use that time to try some new drills from the DVD I haven't done yet. But essentially you should be doing what you think will benefit you. I've got to do a lot of mobility drills and a lot of abdominal "core" work because I'm coming back from an injury; so really its up to you.
-Matt
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