I am not sure what a Johnny G Spinner is...stationary bike? But, I know from experience with working out with a trainer that anything you do for 30 min's a day that raises your heart rate and makes you sweat will burn fat and inches. So, if you're able to spin 30 min's a day, go for it. How do you feel afterwards? If you feel fatigue past normal "post exercise" fatigue; or if you feel uncomfortable during the day afterwards, you're probably doing too much. I used to go to a workout facility called "Curves for Women" and I loved it. I never once came home feeling lethargic or fatigued and never woke up the next morning sore or tired.
So, I guess it is all in how you feel. At what pace are you riding? What are you consuming during the day (fats, carbos, proteins...) I have found it all goes together. I can ride my bike 3 days a week at a higher cadence and longer distances than the other 3 days a week when I "recover". Then I rest one day.
Hope this helps.
Kim



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