May I know how long after (normal) delivery can we start exercising?

I started to briskwalk around my neighborhood park 2 months postdelivery, after settling down emotionally and physically. During the first 2 months, I have no time to exercise as I have already lack of sleep and no stamina to do any exercise. I started to swim when my baby is 4-5months old and it was manageable, at least I know my wound no longer hurt. Thus, as long as you feel comfortable and no stretching/hurting your wound, you can start as soon as you feel like. Also, if you find exercise is able to help you to destress and relax, you should do more often to break away from stresses.