Exercise and lifting is usually out of bounds for 6 weeks to allow time for your wounds to heal and also to avoid an unnecessary build up of fluid in your breast that will give you grief in a couple of weeks! Maybe try a walking group at a community centre near you. Or you could try the treadmill at the gym if you’re missing that vibe - but no lifting or stretching arms! I’ve also seen a physio to help ensure I don’t lose strength and she’s given me exercises that I can do while I wait! Good luck!