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This is an exercise suitable for the strengthening and training of the thighs and glutes.

Stand with your back to the G-Flex, place one of your feet into it, your leg should be in square position. Lower yourself into lunge position while you push your leg in the G-Flex backwards. Pay attention that in case of your leg on the ground your knee should form maximum a 90 degrees angle, it should remain behind your ankle and toes in no way.