Breast Stroke is tough
don't underestimate the breast stroke. I do sprints using the breast stroke. After a lap, I rest for 1 minute before the next sprint. I do this for 10 sprints, and I've to call it a day. At the end of 10 sprints, I feel like I'm in the gym for 3 hours. My chest muscles aches, my thigh muscles are screaming and my triceps are killing me. I can't do this for 2 days in a row, have to rest a day, actually 2 days is better.
I find that for breast stroke, the power is in the legs. You really have to push hard with the legs to get good speed. There was once, my knees were painful, so I ease up on the legs and put more power on the arms. My speed slowed down by 10 seconds per lap. Very dramatic slow down. I didn't know the real reason till my knees healed and I started using my quads again. I thought maybe my gym training was overtaxing my chest and tricep muscles and thus my arms muscles are weaker from overtraining. However, when I was using quads to push, my speed returned to normal. So it's the legs that gives you the power, not the arms, no matter how strong they are. The difficult thing with breast stroke is the synchronization between the legs and hands. In the front crawl, synchronization between hands and legs is not so important.
I tried the front crawl, but after a few weeks of consistent swimming with it, I got pain in my rotator cuff. I went back to breast stroke and the pain went away. Maybe it's the wrong technique, but I find that breast stroke is more forgiving in terms of injury through constant swimming.
The lats don't get much of a workout in breast stroke I guess, but I supplement that with workouts in the gym, to build the muscles in those areas.
I like swimming as a means of exercise. In a swimming session, I get cardio exercise and muscle building, all at the same time. If you're doing sprints, that's the same benefits as interval training, and it burns fats real fast and it keeps burning throughout the day because the muscles are also used as well. In the gym, I'll have to lift weights and go on the stationary cycle to get the benefit in twice the time. Can't do running because of my knees.