Here is another multifunctional fitness trainer that helps you warm up, work your core, and burn lots of calories in small spaces. Ucantry can be used as a push up stand, kettlebell, dumbbell, ab wheel, and yoga trainer. It doesn’t take a lot of space (0.2 sqm).
This circular tool can be used with wheels for ab training. It also has a brake system when you want to do push ups. Like what you see? You can find this project on Kickstarter.