Your guess is as good as ours!  For the fit and adventurous?  :)  This is what Amazon's listing has to say about this inventive exercise piece of equipment:
 
【HIGH-EFFICIENCY SPORTS EQUIPMENT】 Exercise more than 99% of the body muscle fibers through high-frequency vibration.Effectively stimulate the deep muscles, arms, chest, back, abdomen, the whole body can work, burn fat and quickly build muscle.
【DETACHABLE】 63-inch rebound bar glass fiber swing lath trainer.Resistance exercises, which work 99% of the muscles in your body, vibrate 300 times per minute.
【FOR PHYSICAL THERAPY】 Suitable for physical therapy, body blade physical therapy.It is also designed for rehabilitation exercises to treat rotator cuff injuries or shoulder injuries.Just 10 minutes of exercise a day can make your body healthy and beautiful.By applying more or less force to the barbell, you can adjust the difficulty level of the workout to suit you.
【PORTABLE FITNESS BAR】High strength FRP counterweight bar, ergonomic non-slip design handle, safe, comfortable and quiet.2 sections in total, easy to assemble and carry.LECONLAI fitness exercise bar for men and women at home, the gym, the office, or on the road.You can use it anywhere.
【SUITABLE FOR THE CROWD】Fitness crowd: strengthen the deep muscle tissue of the trunk, promote metabolism, long-term effective.Reduce weight person: high frequency vibration can make flabby muscle swing.Beautify your posture, strengthen your back muscles and improve your figure.Teenagers: promote physical development, improve physical fitness, improve attention, stimulate brain and limb coordination.
 
LECONLAI Abs Exercise Bike is a high-efficiency sports equipment for core strength training, suitable for physical therapy and rehabilitation exercises. It is portable and suitable for a wide range of users.