The PerSyst Fitness trainer works with any power rack and barbell assembly to provide: - Your very own Electronic Strength Coach, right on your smartphone delivering maximal gains in minimal workout time. - Optimal computer-controlled assistance providing help at just the right time. - Personal diagnostics that give guidance/motivation for improved strength and performance (aim for 110% in the GUTS metric). - 7+ lift modes to surprise your muscles: max out with assisted reps, feel 'massive' weight with heavy negatives or breakthrough sticking points with assist-to-negative mode. - Unique, patent-pending electrical lift-assist technology…No more getting stuck!. - Ability to work to targeted1RM and be alerted when rep goal reached. - Assistance for bench press, squats, military press, arm curls, and more...