Is swimming everyday healthy for your muscles?

Absolutely. Swimming is one of the most complete exercises you can do to keep muscles healthy and strong.
Yes. Excellent low impact exercise. However -- too much, too hard and you can develop things like rotator cuff injury. Enjoy it and be careful and sensible. Swim for life !
Definitely, yes. It also help boost metabolism to keep calories burning.
Swimming. Swimming is an excellent daily exercise. There is no impact to your joints and there is conditioning for multiple different muscle groups.