Schwinn 6700P Specifications:

6700p is a heart-rate controlled treadmill, meaning it
automatically changes elevation to keep you in a
predetermined heart-rate zone. It’s also the lowest-priced
to offer 11 mph maximum velocity, ideal for interval
training, which serious runners use to increase their
speed. It’s got a 2-HP engine with PWM, a 52- by 18-inch
belt and 12 preset programs