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 Pain Relief, Spine Decompression, Leg Stretching & Core Activation
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 Machine Spine Twist & Stretch Trainer Effective Waist & Spine Workout, 3 Adjustable Height LED Counter 100kg Capacity, Detachable, for Full-Body Workout(Black)
3-in-1 Spine Twist Stretcher & Stair Stepper & Waist Trainer, Waist Twist Machine, Adjustable Back Stretcher Machine for Lower Back Pain Relief, Core Activation, Balance & Full-Body Home Workout
SAVEYOUR Crawling Workout Machine, 3 in 1 Spine Twist Stretcher, Stair Stepper & Waist Trainer, Adjustable Back Stretcher for Lower Back Pain Relief, Core Balance Low-Impact Full-Body Home Exercise
KINMAC 3-in-1 Spine Twist Stretcher & Stair Stepper & Waist Trainer, Multifunctional Trainer Adjustable Back Stretcher Machine for Lower Back Exercise, Core Activation & Full-Body Workout
