Rather than shortening and tightening muscles, which is a common result in traditional weightlifting, they're designed to lengthen and loosen muscles while attaining greater flexibility and range of motion.
It is optimized to provide the ability to travel in all-electric mode for typical daily use, but can also leverage the existing gasoline infrastructure to power its range extending generator, as needed, thereby eliminating 'Range Anxiety' and providing the freedom, flexibility, and peace of mind that comes with the extended range of a conventional vehicle.