Getting in a little Cardio!

Rode stationary bike at the gym today:
45:00
15.35 mi (avg speed - 20.47 mph)
288 cal (per heart rate watch - machine recorded far less than 200)

Boy, I didn't think I could get through the full 45!  Either those seats are too small or my rear is vertically challenged (LOL)! 

Planning to register for an indoor Ovarian Cycle fundraiser taking place next month (6 hours) - so I need to 'toughen up' my rear!