Learning to do pull-ups was for me. I bought a pull up bar around late February and I just did dead hangs randomly throughout the day, attempting to do chinups every time. I started with chinups as I found it easier than pullups. I did easily around 100 attempts a day and by the end of the month could do 10x5 pullups (neutral grip, i find it more natural), but the breaks from each set is like 3-5+ minutes. Today my routine is 20 sets of 12 pullups 3x a week, this time the breaks from each set is about 1 minute. I also started pushups around that time, and within a month I could do 10x10. Now my routine is 10 sets of 32 reps. I could max out more reps but my bottleneck is breathing: I would run out of air before my muscles fatigue, same with my pullups. Looking for advice on that but I think the biggest factor is either my breathing is wrong, or that because I dont do cardio.
cardio capacity develops differently than strength and generally slower, but can be trained for directly too like you did for strength by frequently doing things that make you breathe hard and then pushing that limit
depending on what you are doing now, you could also focus on continuous breathing so that you don’t hold your breath, which can be a normal reaction to doing something with power, but limits endurance
