My dad is wanting to start mountain biking with my brother and I. He is 57 yrs. old, and he is in great physical shape. He goes to a gym around five times a week. Does strength training and does cardio(running and exercise bike) I was wondering if you all thought he would be fine with a hardtail, or do you think a full suspension is needed. He is going to be mtn biking for cardio alone. No jumping at all. Thanks guys.