The Helix HLT3500-3D represents a true revolution in fitness. With patented movement that works the body in all 3 dimensions of human motion, it trains as nature intended: in full 3D. Working in 3D is not just intuitive, it also confers more comprehensive training benefits, with more muscle activation and enhanced strengthening compared to other cardiovascular trainers. Test results have shown that people using Helix burned an average of 50-60 more calories per hour than others using other lateral trainers, yet heart rates and perceived intensity remained the same. Knee rotation is key to joint health; Helix 3D models provide the greatest degree of knee rotation of all cardio trainers studied. The Helix 3D models demonstrate a more comfortable gait because they dissipate some of the lateral motion, allowing for complete rotation without undue bending or forcing a part of the hips. Helix lateral trainers also achieve targeted heart rates more quickly and produce dramatically increased muscle activity when compared to "traditional" cardio like ellipticals. With a built in Polar compatible heart rate receiver keeping track of heart rate. The center console has a TFT interactive display that is easy to read. There are 12 programs, including Helix Intervals and HIIT Intervals. But for those who just want to dive right in, there is a built-in 'Quick Start' function. The Helix HLT3500-3D features 20 levels of resistance and pedal direction indicator as well as guidance. It also features workout history tracking with a user-friendly personal data saving function for quick workout access. Feedback measures Time, Calories, RPM, Distance, HR, Level, METS and Watts in real time. Please note, this unit does not require electric power. Please note, this unit does not require electric power.