![Contracción doble de cuádriceps e isquiotibiales](https://www.workoutsprograms.com/media/cache/exercise_375/uploads/exercise/contraccion-doble-cuadriceps-isquiotibiales-init-pos-5937.png)
STARTING POSITION:
Lie on your back on a mat and extend your arms and legs.
MOVEMENT:
Contract at the same time your quadriceps and hamstrings hardening your legs. Maintain the tension during the required time. Relax the muscles and repeat the exercise.
TIPS: Make sure you do the exercise without any movement of your body.