Here is a compact treadmill that gives you a good workout indoors. The Reebok i-Run 3 Ultra-Compact Treadmill is designed to go easy on your joints with its 8-piece elastomer cushioning. It comes with a 1.5HP motor that reaches speed up to 8 mph and has 2 manual options.
This exercise machine has hand pulse sensors, so you can keep an eye on your heart. It has a console that gives you access to 12 presets and 3 target workouts. The i-Run 3 treadmill has a 47 x 16″ running area.