The Supine Bridge Exercise is great for strengthening your lower back and pelvis, which prevents any imbalances that might cause you lower back pains.

• Lie down on your back, with your knees bent, almost like you would if you were to do crunches or sit-ups.
• Gently squeeze your glutes and gently lift your pelvis off the ground upwards.
• Hold for 5-15 seconds, then relax back to the starting position.
• Be careful not to arch your back while you do this however, and focus on moving your pelvis with your glutes and your hips.
• Repeat 10 times.

Keeping the correct form is most important while performing supine bridge exercise. It will also help you tighten your glutes, and also get your back loosened and ready for your run.