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Yes you can. I gained 10 pounds pure muscle doing only push ups, but it's how you do them that matters. You have to progressive train. I was doing only one set, but doing them to exhaustion. Then on...

It can be cardio if you are doing high reps. The best cardio is walking and running. Running is much harder than lifting weights, if you don't believe me try to run 1 mile and you will see

Yes and no. The answer is not that simple. No weight lifting doesn't usually cause scoliosis cause if it did all people who lift weight would have scoliosis. But some people have genetic...