Looking At Ceiling alternatives

7 exercises that train the quads like the Looking At Ceiling does. Different equipment first.

Exercise	Equipment	Also works
Kneeling Hip Flexor	Body only	Quads
Standing Hip Flexors	Body only	–
Frog Hops	Body only	Calves, Glutes, Hamstrings
Lying Prone Quadriceps	Body only	–
One Half Locust	Body only	Abs, Biceps, Chest
Rear Leg Raises	Body only	–
Sit Squats	Body only	Abductors, Glutes, Hamstrings