PTs gave me this (the first exercise with rubber band). Do deadlifts and squats do anything for hip flexors?
This might upset VM, but this guy says deadlifts are not the cure all for the back. I'm also going to try some of the variations (of exercises I'm already doing- bridges and superman) in the second video-
Respectfully, I wouldn't give a person advice on treating advanced heart disease and your doctor is obviously not qualified to give advice on strength and training.
The rubber band exercise he gave you is the exact same rubber band and exercise he gave the 70 year old lady just before you. I'm guessing your much stronger than a 70 year old potato but only you can judge that. This underscores what I've been saying though. There is no way a rubber band is going to be anything useful or do anything for you, but your mind will wrap around it, after all, he's a doctor and you'll believe your doing something to get well.
The deadlift works every muscle in the body. The primary muscles are all the muscles in the back, from your neck to your tail bone, glutes, hamstrings, and the muscles in and around the hips, including and especially the hip flexors. During the deadlift every muscle in your body will be contracted isometrically as hard as you are able or the bar won't move.
I've known Jeff for years and he has a lot of good information to share but his focus is more geared towards aesthetics and not specific to making a person strong as quickly and efficiently as possible. If you're looking for a leaned out six pack look, he's your guy.