If you like running at home but don't have a lot of space, you should opt for the collapsible Flow Fitness DTM300i treadmill. The console of the machine can be collapsed to a height of 14 centimeters, which means you can easily put it underneath your bed. Use the touchscreen to easily set a training program or to increase the resistance. You can also connect the machine to your phone via Bluetooth and use the Fitshow application for even more workout options. On top of that, it's possible to connect a separately available heart rate strap to the DTM300i via Bluetooth. With a maximum walking speed of 12 kilometers per hour, the treadmill presents enough of a challenge.