Author	Primary Muscle(s)
Rod Ferris B.A. CPT(ACE, YMCA), CPAFLA	Rectus Femoris, Gastrocnemius, Biceps Femoris, Hip Flexors (Quadriceps, Calf, Hamstrings, Butt, Legs)	|

Shuttle Run- Cardio How to do - Exercising Instructions

To begin this exercise stand in the middle of two lines. In this example we will use the 0, 20 and 40 yard lines. From the 20 yard line sprint to the 40 yard line and immediately back to the goal line (0 yard line). Then sprint back to the 20. This drill will increase your agility, speed and overall quickness. This drill should be used during any athletic training program.

Shuttle Run | Cardio Variations and Other Rectus Femoris Exercises

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Quadricep or Cardio Muscle Anatomy Quadriceps or rectus femoris is perhaps one of the largest muscle groups in your body and should be trained with the same intensity as your biceps femoris or hamstrings. Quadriceps are extremely important for any athlete and should be trained in compound movements to maintain symmetry with your hamstrings.The function of the quadriceps or Rectus Femoris are for knee extension and hip flexion.The origin of the quadriceps attach onto the Illiac Spine of the Ilium and the lateral, anterior and medial surface of the femur.The quadriceps insert onto the patellar tendon of the Tibia.Training recommendations for the quadriceps should consist of many major compound exercises such as the squat, lunge, jump squat, and deadlift. Other names for this muscle group or similar muscle groups referred to the 'Cardio' are: Quadriceps, Rectus Femoris, Thighs, Inner Thigh, Outer Thigh, Quads, Legs, Lower Body