WALK TO THE BEAT You get two coaches on this special Interval Training RX treadmill workout. Â Both Lisa Hisscock and Skip Orem will challenge you to walk faster during this Treadmill Walking Challenge Workout. This is our last Interval Training Rx Workout for this year. Â Not to worry, we will be back on January 1, 2014, with a brand new ITRX workout. Â We are in the process of changing the design of the ITRX website and will have some neat things to talk with you about during our 2014 ITRX workouts. Â Have a great holiday season and we look forward to talking with you on January 1.