You don't need leg raises or heavy weights to strengthen your core and hips, just try the dragon flag calisthenics exercise.

Place a small towel on the floor, and sit with your feet flat on it. Use only your toes to scrunch up the towel towards you, then release it back out again. Perform this exercise ten times per session ...

Sit with legs extended and loop a resistance band around the top of your foot. Grasp both ends of the band with your hands to ...