I have been cycling for a couple of years, and last year I talked my 62 year old dad into training for a 50 mile ride with some boys from my son's scout troop. He has diabetes, and needed to take insulin 4 times a day. The doctor said exercise would help him. The first time we went out he was shaking after 4 miles, but he went out and bought a bike and helmet the next day. We trained together a couple of times a week, but he started riding at home on the other days. He never thought he could do 50, but having that goal, and a couple of months to work up to it proved he could. He was an inspiration to these teen boys that could barely keep up with him. Well after that he was hooked. He bought a fancy bike that has the clip pedals. He competed in the Senior olympics in our area and won a bronze medal. And this spring he did a century ride for charity. His heart is stronger, and he only needs insulin once day, and he has lost 20 pounds. His doctor is estatic, and uses him to inspire other patients. Here are some tips for your dad. 1. Make sure the doctor knows what he is doing. 2. Get him a heart rate monitor (you can find a decent one for $50-$100, look for one that alarms if you go too high, and has an average heartrate) and help him find out his maximum zone. This has several advantages. One, if he is going too hard, he can slow down or stop. Two, he can see improvements over time. My dad thinks it is cool how much quicker his heart rate recovers from doing the hills than it used to. 3. Make sure he is taking precautions like taking a cell phone, id card, couple dollars, and repair kit for fixing flats and stuff. Also he needs to stay well hydrated and prepared for the weather. 4. Make sure he knows to stretch. Especially his hamstrings because they will get tight, and keeping them flexible will help him avoid injury. All in all it is a great exercise for everyone. My dad is having the time of his life. He is training to take the gold at the senior olympics this year, and another century after that. Don't worry about the pedals. It only takes a couple of falls before your remember to clip out before stopping I think it is great that your dad is moving. Encourage him because it is better to move than grow old and never move out of the recliner. Blessings Psychomom