It is pretty advanced. I've been running and doing aerobics off and on for a year, but it is still intense for me. I did the first week all the way through, but I crashed on metcom 2 of the second week. I do run several times a week too. I would listen to your body, or maybe take longer breaks within the class and come in when you can. I'm still plugging on tho. Mobility is a great recovery.