We have seen many guys doing abs workout daily. It should be clarified that most people who weight train have a 6 pack already. They just need to lose fat. And the point here is that they shouldn't be trained everyday.

Its because when you do squats, overhead press, or any number of movements, you're also using your abs. So a leg day = ab day. Shoulder a day = ab aday. That is why once a week is usually good.

Every injury the human body sustains can be healed, with the exception of nerve or brain damage. Give it time, and it will heal.

Rotator cuffs can take several months to heal. Afterwards, people feel pain when they use their arm and think that its somehow still injured, when in fact the shoulder is just tight.

Most injuries can make muscles tight, so you have to stretch it out. But do this only after you're certain the shoulder is actually healed.

Stretch slowly and progressively until your full ROM has returned without pain. When you start weight training again, do it like a 9-year-old girl. For the first few weeks, be very careful as you get back into it. Be progressive but cautious, and you'll get back to where you were before.