The Precor EFX 576i Experience Elliptical is a high-end trainer that boasts of pretty advanced features. Starting with 15 workout programs, the EFX 576i should be enough to satisfy the needs of even the most demanding of gym goers. There are 20 resistance levels available on this workout machine, thus exercisers can shift from low-intensity to high-intensity workouts in no time at all. This elliptical machine has a stride length of 18 inches, and features dual step-up flywheel as well as rear-leveling feet. Its upper body handlebar should give your arms a good workout.