must not handle much weight with 15 second rests... So you get what? 10 reps the first set, then 2 the next?
Dosen't make sense...
You're thinking about it in bodybuilding terms.
One minute could be 30-40 reps of DB chest press
One minute could be a plank
One minute could be a farmers carry, bear crawl, sprint, pullups/burpee combo......
But I also do regular cadences of sets and reps on squat / DL / Bench ,etc....
But as for the weight, if you have muscle, you won't lose it. SC who used to post here, switched to these style workouts and goes up to maybe 35lb DBs max. Hasn't lost an ounce of muscle and has a better build than 98% of the people here. I haven't lost anything either, just flub.