Stand up straight with a looped resistance band tied to a solid object at one side.
Step the leg nearest the band into the loop.
This will be the leg you exercise.
Lift the leg with the band out to the side ensuring there is still some slight tension in the band.
Keeping your back straight and your hips level, move your leg with the band attached straight across in front of your stance leg.
You may only manage to bring your leg to meet your stance leg.
Ensure you do not lean your body or hitch your hip.
Your leg should remain straight.
Control the movement as you bring your leg back out to the starting position.