ESC - Electronic Stride Control: Unique to Bodyguard, this system ensures that the selected speed remains the same regardless of the user’s weight or the incline of the treadmill. AFDS - This advanced protection system prevents overheating of the motor and shortage of the drive by verifying, in real-time, the friction level between the running belt and the deck. CHR -Allows you to measure your pulse accurately to better monitor the intensity of your workout without having to wear a chest strap. BDS Plus - (Bodyguard® Dissipation System Plus) has a greater durometer rating (measure of hardness) than Bodyguard®’s regular BDS compound. This higher progressive durometer rating provides unparalleled shock absorption performance under intense pressures such as the downward force of a runner planting their foot. BDS+ provides even better protection for heavy users or runners and is therefore found exclusively on Bodyguard®’s X-frame treadmills. This combines the leading running treadmill frame with the leading treadmill shock absorber. SK - The silicone keys are able to withstand over 5 million touches, and provide the soft touch feel. Just another indication of quality in manufacturing and attention to detail. Just Go - Just get on any Bodyguard machine and press the green button twice to, JustGo. X Technology - Bodyguard®'s interactive equipment provides you with a full personalize X-way of training into your lifestyle. Offer multiple categories such as: Healthy Weight, Body Shape, Energy, Sports Training and Outdoors including adapted programs with levels to achieve different fitness goals. Acquire your results by logging on Bodyguard®'s website. Keep track of your improvements and visualize your training data using graphics, charts, and reports. Get the benefits of working with your fitness instructor at home.