Reasons for choosing SALEMFIT Exercise Bike Newest Version 3-in-1 Folding Bike It can adjust the tension knob to 3 fitness modes-upright/semi-recumbent/recumbent position. The SALEMFIT 3-in-1 folding exercise bike adopts a special X-shaped design, which meets the habits of different people using exercise bikes. Children and the elderly can also use X-Bike. The exercise bike with Fitness elastic rope to help people exercise arms and relax muscles. Users can get whole body exercise by SALEMFIT 3-in-1 Folding Exercise Bike.