Figure 2. Foam Rolling for the right anterior thigh (a), positioning of the Near-Infrared sensor (optodes covered with a strap in order to fix the optodes and avoid scattered light) at the anterior thigh (b), tissue stiffness assessment using the MyotonPro® at the same spot of the anterior thigh (c), and muscle stiffness assessment using the TMG® (sensor tip and electrodes) again at the same spot of the anterior thigh over the rectus femoris muscle following the SENIAM recommendations (d).