Abstract: The present invention is a bed sit-up apparatus that allows a user to perform sit-up exercises and other related exercises comfortably on a well-cushioned mat such as a mattress of a bed without the need of an individual restraining the feet of the user throughout the exercise maneuver. The present invention comprises a board, a strap, a sleeve and a tri-glide slide. The strap is attached to the board by traversing therethrough via a first strap slot and a second strap slot. The two ends of the strap are subsequently united and attached to each other via the tri-glide slide. The length and the circumference of the strap are adjustable to fit the width of both feet. The present invention also comprises the method of use of the bed sit-up apparatus. The method not only includes the traditional sit-up maneuver, but also side sit-up and leg maneuvers.