CycleOps’ JetFluid Pro Trainer is your secret weapon. Use it whenever time or weather constraints arise so you can stamp your authority on the hills, races or group rides next time the sun shines. The Pro features progressive resistance, where just like the real world, resistance builds the faster the wheel spins. Charging through 600-watt intervals or spinning easily in the little ring requires no adjustment; the power curve automatically changes to give you a silky-smooth workout. Plus, the Fluid is whisper quiet and the frame is tough, sturdy and stable so you can ride as hard as you want.