Doorway pull up bars are great. They are cheap, easy to set up and turn any doorway into a bodyweight gym.
The only downside is they are a bit low to the ground for most people. This means you won’t be able to get a full body hanging stretch without your feet resting on the floor. It’s not a deal breaker for pull ups, you just pick you your leg, but what about leg raises? If your legs can’t hang straight down doesn’t that compromise your leg raises?
Maybe not. You may even be better off not letting your legs hang all the way down and keeping them in front of you might make leg raises more effective.
Check out this video to learn the best technique to use for straight leg raises on a doorway pullup bar.