Abstract: The foldable portable treadmill (10) of the present invention includes left and right treadmill sections (12, 14), each having support rollers (20, 22) and an endless belt (24, 26) with bumps (36, 38) on the outer surface thereof. An electric motor (32) drives the belts. A hinge (40, 42) connects the side edges (16, 18) of the treadmill sections together so that they can be folded over each other for storage or transport. Wheels or rollers (84, 86) carried by at least one of the sections allow the treadmill (10) to be rolled across a floor when the sections are folded together. Telescoping handles (66, 68) are movable between an operative position where they extend upwardly from the treadmill sections when they are opened in order to be grasped by a person using the treadmill and an inoperative position where they can be used for transporting the treadmill when it is closed. When the treadmill sections are open for use, the spacing between them can be adjusted.