I think the rules with resistant bands are pretty much the same. If you can do more than 30 repetitions without muscle failure, then it's probably not going to be very efficient, things have to be stressful enough to trigger a training effect. So then I'd throw in the same caveat of the possibility of aerobic fitness limiting your ability to train anaerobically.

I'm not sure failure is necessary, even at 30 percent of one rep max. The studies I'm basing the stuff I'm saying about 30 percent max generally have three groups--one at say 80 percent max, that's usually around 8 to 10 reps to failure, one at 30 percent of max but "work equivalent," (weight times total reps=total work) one at 30 percent but to failure. The failure groups get pretty similar result. The non failure group does get a training effect, but it's a bit less than the failure groups. I think it comes down to how what you're doing compares to your usual activities. For somebody usually confined to 24 hour bed rest, there'll be a training effect just from standing up for ten minutes a day. And if you look at runners, running doesn't come anywhere near the repetitions to failure that the weight lifting studies suggest are necessary to promote muscle growth, but their leg muscles can be quite well-developed.

So I'm not saying you won't get a good training effect from those videos, just that there might be more efficient uses of your time for lean mass.

There are good things to be said about exercise that straddles the aerobic/anaerobic line, though. Sprint intervals are supposed to be pretty good vs. insulin resistance, that might look like 20 seconds of some kind of sprint, and then 1 minute of slower-paced movement, then repeated, I think the differences in metabolic demand going from exercise to exercise in those videos probably has some similarity to interval training.

I lift almost daily. I usually do legs one day, upper body the next. But sometimes I've done full body workouts every day, or the same thing three days a week. The more often I'm exercising, the less volume I do per session, if I'm going full body every day, I'll just do about 6 exercises, one set per exercise. One reason I do this has nothing to do with physical fitness. I'm bipolar, and keeping a regular daily schedule is supposed to help keep things level.