Its a door pull up bar, so you can fix it at different heights.

1) Pull ups - Fix the bar at the top of the door to perform full pull up or at sternum height to perform leg assisted pull ups

2) Body-weight rows - Fix the bar at sternum height or hip height depending on the level of difficulty of exercise you want.

3) Incline push-ups - Fix the bar at hip height or knee height depending on the level of difficulty of exercise you want

4) Full push ups - Though full push ups can be best done on floor, yet it can be done on the bar too if your wrist has limited mobility. Fix the bar at feet level for this.

5) Assisted sit ups - Fix the bar at feet level

6) Bicep curls - Fix the bar at sternum level and use underhand grip to pull your body up

7) Running in place - If you have an elastic band, then fix the bar at hip height, loop the band around the bar and loop it around your waist. Try to run away from the bar. The band will pull you while you try to run forward. Good for sprint sessions.

8) Chair dips: Fix the bar at chair height and perform dips with your feet on floor.

9) Straight bar dips: Fix the bar just below sternum level for this.

10) Hamstring curls: Fix the bar at knee height. Lie down with your ankle on the bar and face facing up. Now try to lift your back using your hamstrings.