1. The Lopifit electric walking bike is powered by a treadmill.
walking bike combines a treadmill and bike. It's powered by walking on the
treadmill and can go up to 18 mph for upwards of 50 miles per charge. Lopifit
describes the bike as "low physical impact, high cardio, high-calorie burn
exercise" and eco-friendly way to commute. It starts at $2,895.