This project work modifies a treadmill to better fit the requirements of users. Treadmill bicycle is designed for those humans who love to run outside. Treadmill equipped on tricycle frame and formulates a big innovation named ‘TREADMILL TRICYCLE’. As the rider walks on the treadmill, the belt butts up against the rear wheel propelling the bike forward. Treadmill tricycle is designed for runners as the ideal treadmill device, this device combines the best exercise running and cycling to deliver a low-impact, high-performance exercise outside home. We think that this device is perfect for healthy runners. The exercise experience on this device is almost same as running than any other exercise type available today.