There is nothing soft about a Sissy Squat.  This variation of squat can be more challenging than most other forms of squatting.  Performing sissy squats isolates the quads and is also an excellent alternative to performing regular squats.  The Sissy Squat is designed especially for those who suffer from lower back pain and other ongoing injuries that may have resulted from performing regular barbell squats.  The Revolution Sissy Squat has a solid and compacted design that is made to last.