http://www.movescount.com/moves/move18563519
Went for a 6 mile ride with my oldest. He hadn't been doing anything since hockey season ended, so he was looking to ride with me to help get back in shape. 3 miles up and 3 down was almost exactly his limit. So we're gonna ride more often.
Did it on the mountain bike, average heart rate of 135. Decided I need a new bottom bracket for my bike, but I have absolutely no idea what my 25 year old mountain bike takes. I'll have to see if I can find out.