As for the soreness, it's always MUCH worse after your first few workouts. (weightrainer.net)
You'll have more energy for the next few workouts and your body will burn fat much more efficiently. (leangainsguide.com)
True, the initial few workouts will potentially make your wrists and knees sore, but this will also be the time when you strengthen them to withstand further stresses. (bodybuilding-wizard.com)