Definitely want to increase your endurance, go to the gym 3-4 times a week for an hour, 30min weight lifting the other cardio. Work on your back, legs and especially the core. For cardio try the bike, treadmill and my favorite the stair master, by far the best thing for cardio. It
will help you last longer in sets to make them more productive, as @Than_Bogan said your hands will give you trouble, If you get blisters, try putting lemon on it, hurts like heck, but will speed the processing of healing.