Do you love climbing so much that you'd want to do it even when you're at home? If so, you'll probably love the Treadwall. It's like a treadmill but for climbing instead of running so you can climb in place to your heart's content. Even if you're not a climbing fanatic, the Treadwall is great for building strength and can give you a great cardio workout at the same time. The speed is adjustable and with the PRO version (shown above), you can make your workout even harder by setting it up at an angle (+5 to -20 degrees). If you want something bigger, get the Treadwall M6. If you're on a budget, consider the base version of the Treadwall.