This strong exercise requires your hamstring and glute to work to straighten the back leg. Step up to a wall with your left toes about five centimetres away. Step back with your right foot until your left thigh is parallel with the ground, while your knee remains directly above the ankle. Place your fingertips on the wall. With the right heel lifted, rotate the right outer thigh down and broaden and lift the right hamstring to straighten the right leg.
Hold the lifted straightness of the back leg and rotate your pubic bone toward the wall. If possible, hold that position and extend your arms upwards, lengthening upwards also through the side chest and the crown of your head.
Hold for five breaths and repeat for the other side.