In reply to purple sue: I do a bit of both most lunch times. Start with 20mins of yoga to keep the flexibility going, then pick up my dumbbells for shoulder presses, rotator extensions, tricep extensions, reverse wrist curls etc. I also made a 'weight on the end of a stick' thing for antagonist elbow exercises (after seeing a useful video on here a year or so ago).
I find this just about keeps me the right side of injured and able to train my climbing