Alcoholics Anonymous provides a support system for those dealing with alcoholism because it allows people who have the same issue who can relate to each other motivate each other to stay sober. Hope this helps! :)
Don't really worry about pushing too hard, it's even ok if you were to break a rib or two. it's better to push too hard than not hard enough
It isn't heart healthy. That's something that's not true.
The answer is 20 minutes a day in order to have an effective cardio exercise.