Capital Sports Fusion Bike Fitness Bike with Magnetic Resistance - 3-in-1 Home Trainer, Cardio/Standing Bike, Ab Trainer, Belt Drive with SilentBelt System for Quiet Training, Tablet Holder - Onyx : Amazon.co.uk: Sports
Core Workout: Ab Exercises to Strengthen Your Core in One Month
LONTEK Standing Bicycle Exercise Bike, 3-in-1 Foldable Exercise Bike with Arm Trainer, 8-Level Adjustable Magnetic Resistance, Fitness Bike with Hand Pulse Sensor, 120 kg Load Capacity : Amazon.de: Sports & Outdoors
I did the standing bicycle crunch for a week — here's what happened to my core | Tom's Guide