Originally Posted by
silverider
It all boils down to heart rate. For cardio workout take 220- your age. Approximately 70 - 80% of that number is your target range. Get a good fitness watch like an Apple or Fitbit and you'll know---whatever bike you're on....tht you are getting the best "fitness" workout.
This useless formula should be made illegal. For me it's about 25 bpm too low.