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Therefore you want high repetitions with low weights.

Below are some of the best stretching exercises, 2 reps for 20 seconds each for marathoners:
• Hamstring stretch
• Piriformis Stretches
• Quadricep Stretch
• Iliotibial (IT) Band Stretch
• Calf Stretch

Just remember, your goal is to create springy and toned muscles.

On your off days, it is better to do strength, core, shoulder, back, and arm exercises.