Exer-3/6 (Columbus Instruments) is the third generation, general purpose three (rats) or six (mice) lane animal treadmill that uses a single belt construction with stainless steel dividing walls suspended over the tread surface. An included drive motor controller provides smooth and continuous adjustment of speed in the range 2.5-100 m/m in 0.1 meter/minute increments per second. The treadmill inclination can be altered manually from -15° to +25° in 5° increments. The exercising belt is made with special material that facilitates the animals' grip and is easy to clean. The treadmill has the electrical stimulus system option composed of six shock grids, each with individual on/off switches. Stimulus intensity is adjustable and LED lamps indicate which stimulus grid is active. Software included, provides remote control over the treadmill and settings for speed and acceleration, records distance traveled, and data is saved in CSV format for Excel or similar statistical software.