I've only done Slim in 6, but the principle is the same. Here's what I think: If you are using them as intended - i.e. you're doing this type of workout most days, or even consecutive days - use very light weights, like 5 lbs. If you use weights that give you DOMS, and then you do the same type of workout on the next day, you're sabotaging your gains. If you can use 10 lbs with no DOMS, then you're probably OK.
If you give yourself days off in between, doing cardio or yoga or rest, then I think it would be fine to go heavier. For me I'd want to do the reps slower to be safe, but that would be an easy modification.
I used 3 lbs with Slim in 6. I didn't do them every day but I was aiming at the every-day effect and so I did other light-weight high-rep circuits on other days. (Doing Burn It Up daily messed with my joints, and also made me want to kill Debbie, so I modified the rotation accordingly. I had really good weight-loss results with my modified rotation.)
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- Laura
"Don't say 'I can't' ... say 'I presently suck at this thing.'" - Matt Meese, BYU Divine Comedy
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