Rehearse the lift in your head

In a small study, people who only imagined doing maximal contractions, fifteen minutes a day, five days a week for twelve weeks, got about thirteen per cent stronger in that muscle. The gain was the brain learning to drive the muscle harder, not muscle growing. A group that trained for real, on a smaller muscle, gained a good deal more than the group imagining it. Evidence: decent

So this isn't a gym replacement, whatever the podcast said. It's a way to keep the nervous system's side of strength while you can't train. Eight people, one muscle, one lab. Evidence: worth trying