I'm 18, I'm 5'1, and I weigh about 135. I really want to get in better shape, but I only want to loose about 10-15 pounds, that will put me at a normal bmi for my height. I just started working out about 10 days ago, and I do 10 mins of crunches, push ups, weights, and then for 20 minutes I'll ride my bike, so a total of 30 mins everyday. Is that enough or should I do more? I've read that I should skip every other day and let myself recover, I've read that I should be doing an hour everyday, so I really don't know.