Mine asked for dumbbells and gym equipment - I got him a set of 35Lb rubber ones...and then I get him a set of resistance bands, so he has some variety...he also wants a pull up bar, but we're negotiating that one b/c I don't want to ruin a door frame...and my spouse isn't handy, so he would do so with a not ideal install...
Get a pullup bar that mounts over the door frame. You just literally hang it up there, no hardware needed. My husband has had a pullup bar the entire 20 years we have been married. No damage done to any door frames. You can wrap the parts that come into contact with the door frame (the sides) with fabric or athletic tape if you wish.