Goal and options: how do you smile?
output answer: make a u shape with your mouth

Goal and options: To fix the dowel on the rubber band gun,
output answer: put the flat side on the gun and use glue to fix it.

Goal and options: How to perform a push-up?
output answer:
Lay on the floor, belly down. Position your hands to your sides, palms flat on the floor. Push up so that your back and legs are straight, and the only things touching the floor are the feet and palms. Lower down and touch your nose to the ground, then push up again.