WalkingPad
The original foldable treadmill: WalkingPad makes walking pads and treadmills that fold flat and slide under a bed or sofa.
WalkingPad is known as the original foldable treadmill, the brand that created the compact walking pad category.  The lineup runs from slim under-desk walkers (A1 Pro, C2, P1) to 2-in-1 walk-and-run models (R2), double-fold running treadmills (X21, X25), vertical-fold models (MX10), and the G5i, billed as the first folding treadmill with auto incline.  Patented folding designs let the machines slide under a sofa or bed, and smart features like FootSense automatically adjust speed based on where you stand on the belt. It's made for people who want a real treadmill workout without giving up a room for it.
"I wanted a treadmill I would’ve using for walking but can also easily fold to store. Treadmill works great for what I need. Easy to fold and roll into a corner of the room when I need it out of the way."
WalkingPadWalkingPad Z3 Hybrid+ Foldable Treadmill