A modular a lower body support device is shown herein. An adjustable frame supports the bodyweight of a user such that the knee of the user rests within a knee frame, the shin of the user rests within a bend frame, and the ankle of the user rests within an ankle frame; a knee pad insert is removably attachable to the frame, and a skid plate insert is removably attachable to the knee pad insert; straps and slots are used to fasten the user to the frame; the user may sit on an integrated seat while kneeling, or may wear the device while ambulatory.