What an interesting style of how to compose the muscles in your body. I can do chin-ups, 6 reps with 75 pounds added to a weight belt and 8 to 9 with 50 pounds added but I only weigh about 155 pounds which is not much to pull-up. I have been working out for years. I am in my 70s and my squat and bench press ire far less impressive but they keep me from getting sarcopenia so my chest and quadracepts look they way I want. Few people in modern culture accept that we get more choice than we might think in what shape body we decide we want to live in.