It is impossible to "outgrow" a spin bike. If you can hold 400 watts for 4x4 intervals you could be competing in the Tour de France. The downside is its not full body but it has infinite resistance and cadence combinations whereas an air bike is locked at the same ratio. You are forced into absurdly low cadence to do long duration endurance rides. I truly don't understand why there are hardly any magnetic resistance full body bikes. They are silent and you can combine ANY resistance setting and cadence to mimic high cadence sprinting or endurance, low cadence climbing, etc without being locked into the exponential resistance with air bikes. Silent full body bikes are a huge untapped market I wish companies would take advantage of...
