Push through your demanding sprint intervals and toughest hill climbs and while staying on top of your heart rate. Stay in your desired heart rate zone when you pair a Bluetooth chest strap or arm band. The treadmill will track and display your heart rate during your workout, so you can stay in your training zone.
https://www.amazon.com/LifeSpan-Fitness-TR4000i-Folding-Treadmill/dp/B002FJXLO6

