This is mine: https://www.cycleops.com/product/supermagneto https://www.cycleops.com/product/supermagneto. I hook it up to a bike computer (Garmin Edge 520) an

This is mine: https://www.cycleops.com/product/supermagneto https://www.cycleops.com/product/supermagneto. I hook it up to a bike computer (Garmin Edge 520) and an app called TrainerRoad (https://www.trainerroad.com/platforms https://www.trainerroad.com/platforms). It's a bit of an investment, but I find that having numbers/instrumentation makes things exciting especially when tracking your progress. My bike and my bike trainer are in my top ten best purchases ever in terms of the value they've given (increased energy, increased fitness).