You ability to squat will likely determine if you can maintain your spine angle throughout your swing. If you are not strong enough to maintain your squat position, you may thrust your hips forward toward the ball at impact, thus pulling yourself out of the shot.

Squats are important for golf and overall strength in legs, glute muscles and core.

Standing in shoulder width stance, lift your arms above your head.
Squat down as you keep your hands over your head. Keep your spine relatively straight as you maintain your knees over your toes.
Try to squat down so that your thighs are parallel to the ground.
Return to the start position and repeat motion for 8 to 10 repetitions.