Almost 50 years with back pain resulting in multiple procedures & surgeries has left me looking for solutions to my need for exercise. Can't stand for any length of time & only walk for 1/2 block before needing to bend over or sit for 30 seconds. My treadmill is out & my stationary bikes are only comfortable for a few minutes. My Sun recumbent trike has allowed to bike several miles so considering rollers versus a stationary recumbent. Winters are cold here. Jim & Sue, Wenatchee, WA.