1. stovepipe exercise
Kneel on the bed, bend over, put your head in your hands, and kick your legs back up 15 times, and change your legs after you finish;
Lift your feet in bed at 90 degrees to your body, and do pedaling with your feet for 20 times;
Lift your feet on the bed at 90 degrees to your body, then separate your legs by about 80 degrees and do 80 movements every day.
2. Drink honey on an empty stomach every morning
3. Thin arms
Stretch your arms to your sides, keep them shoulder-high for three minutes, relax for thirty seconds, and repeat for thirty minutes;
Use two 1.5 liters of bottled water, one in each hand, hold for 30 seconds and repeat for 30 minutes.
I hope the above will help you (swimming is not bad at first, but once it stops, it will rebound, with broad shoulders and thick muscles. I've been there before, give you a warning)