when to swim

So I wanna include swimming into my exercises  after being motivated by the great michael phelps.
I was wondering when  I should include swimming into my weekly workout?  I hear it mainly works on ur chest, so should i do it the same day i work on my chest? Or does it matter if i swim the day after i work on my chest.

I swim occasionally. Although I do quite a significant amount of laps, I still consider it as a recreational activity. It can be considered cardio though...

I would suggest a few laps after any workout (except legs... i tend to get calf cramps swimming after a leg workout, it could just be me though..).

The main muscles used when swimming are lats and legs, but you use every single muscle in your body

Squat max - 245lbs
Bench max - 188lbs
Deadlift max - ¿?
Front Squats(atg)- 5x165lbs

Swimming is great exercise, good cardio, and just generally being in water is relaxing for your muscles. Even a casual swim around a pool without doing laps for a while expends quite a bit of energy. I recommend it if you're looking to cut particularly.

If you wanna swim, I recommend post workout on some day more than anything. Doesn't really matter what day you do it on. - I'd probably recommend the day you feel is the biggest pain in the arse to get through just so you have something to look forward to by the end of it.