It's gotten harder as I've aged to maintain a daily hour of exercise as rigid as an exercise bike on medium resistance. Some days I ride the BYB instead, some days I have to have off. The 18-chain-put-back-on on efforts with the BYB with sumo wrestler like squatting as I faced off with PTSD V sprocket und chain meant strained thighs and my body says to take a day of rest. I feel guilty but it's a legit day off so less guilty for the self-imposed regime of an hour a day. So I don't have to do it; my body says no. But will my mind agree? I don't know.