Despite being a core group of muscles used when running, the hip flexors—a cluster of muscles in the front part of the hip—are a part of the body many people neglect to stretc ...

then exhale as you lift it back up. Perform 8 reps, then repeat on opposite leg. What it does: Activates glutes and lengthens and strengthens hip flexors. Stand with legs just wider than hip-width ...

But the hip thrust is super-effective and easy ... balance it on your hips Keeping your chin tucked in, push up through your hips to lift your bum off the floor Clench your bum at the top ...