Physiologically, no! We lose flexibility in as little as 12 - 24 hours! I know! Yet, if you do a little bit of yoga, even as little as 10 minutes a day, this can keep the gains entrained in the involved muscle fibres. Be sure to do 5 basic poses: 1. Forward bend; 2. Balancing pose like Tree Pose; 3. Spinal twist; 4. Back bend like Cobra or Sphinx; and 5. Inversion (legs in the air) such as Shoulder Stand.