I used to ride a bike for 40 minutes twice a day 5 days a week on the commute, and then ride longer most Saturdays and Sundays A daily 40 minutes on an exercis

I used to ride a bike for 40 minutes twice a day 5 days a week on the commute, and then ride longer most Saturdays and Sundays A daily 40 minutes on an exercise bike, rowing machine, or treadmill doesn't seem excessive.