I do hanging leg raises so I'm glad they're OK.

I think I will google all those key words you gave me. I must be reading really basic weight training books to have missed all these concepts!

Not quite sure what you mean by the leg extensions exercises you asked about. I only have two legs and he did not volunteer any of his

He has told me to raise the leg with bad knee with knee raised slightly on a support while wearing an ankle weight.

He's also got me stepping down off a step controlling the movement with by bad leg and pushing up with the good one to reset. I'm doing 3 sets of 20 for both exercises.