The core waist-exercising function remains fully functional; you can use a phone stopwatch for timing needs.
FlexiHome Spine Twist and Stretch Trainer, Detachable Back Stretcher Machine, Adjustable Exercise Equipment for Lower Back Pa
Multifunctional Crawling Exercise Machine, Detachable Dynamic Spine Twist and Stretch Trainer, Quiet Glide Crawling Machine W
Spine Twist and Stretch Trainer, Detachable Back Stretcher Machine, Adjustable E
Spine Twist and Stretch Trainer Detachable Back Stretcher Machine Adjustable NEW
3 in 1 Spine Twist Stretcher& Stair Stepper & Waist Trainer Crawling Training Machine Noiseless Spine Twist Stretch Trainer with Adjustable Hand Grips LED Display Steel Frame Full Body
Crawling Exercise Machine & Spine Twist Stretch Trainer for Full Body Workout, K
