I agree. Try and include some cardio, (about 3 times a week for an hour a session if you can find the time), and remember it doesn't have to be on a tredmill or on a trainer. You can enrole in dance classes, swim (which will help your flexibilty in pilates even more so), go cycling, aerobics, skate, ski.... whatever interests you and will keep you interested is the key to maintaining a thorough routine.
Good luck with it!