This document describes various mat activities (MAT) used in physical therapy. It discusses 9 principles of MAT including concentration, control, fluidity, etc. It then describes different MAT positions and exercises including rolling, prone on elbows, prone on hands, supine on elbows, pull ups, lifting, quadruped position, kneeling, and sitting. The goals of MAT are to facilitate balance, promote stability, mobilize and strengthen the trunk and limbs, and train for functional activities. Details are provided on how to perform several example MAT exercises and positions.