I think four is great! My son is disabled, and it took forever to teach him how to do a push-up on his knees. Once he learned, I started having him do 1 a day to transition from one of his physical therapy positions to the next. I was so proud of him that I told my dad about it. Dad said, "well, that's great, but one push-up a day isn't going to make a difference in his strength." I said, "Dad, that's 365 push-ups a year. How many do you do?" He admitted that 365 push-ups in a year could definitely make a difference, and it actually has. I have a pull-up bar and could only do one pull-up. It took me a year to get up to 3. When I went to the gym with my husband one time, I did my 3 pitiful pull-ups a little self-consciously, hoping nobody saw me. Well, one of the trainers walked by. He complimented me! I told him I could only do 3. He said that the only about 20% of men can do 1 full pull-up and that the percentage is even lower for women. Body weight exercises are tough. They are meant to strengthen you, so they are meant to be challenging. 4 is really really good! If you're having to work for each one, those 4 dips re doing for your body what they are supposed to do. It's the work we put into each exercise (rather than the number of reps) that makes the difference. I can't do a dip with bars. I haven't tried the assisted ones yet, because we're moving and I didn't want to take the bars out of the box. I have no idea how many I'll be able to do, but I would be pretty proud of myself if I could do 3 or 4. I'll be okay if I can do 2 - I have to start somewhere. I'll live with it and work from there if I can only do 1. If I can't do any with assist, I'll scream in frustration, but that's not going to happen, because I'm stubborn enough that I'll find a way to get at least one with assist. lol