Stand on your right leg with your knee bent. For proper alignment, think hips slightly back so that your right knee doesn't go beyond the toes.
Once you feel stable, lift your left toes off the ground without changing anything in
the hips. Check that your hips remain square.
While keeping the back straight and hinging at the hips, reach the left hand down to touch the ground. Check that your shoulders aren't creeping up by your ears or rolling forward. Take your time and focus on your form.
Do this for 45 seconds, rest, then another 45 seconds.