Where is the backrest?
The Evolution Chair is specifically designed without a backrest to provide optimum health benefits. The absence of a backrest allows for full activation of your deep core muscles. When you sit on an Evolution Chair, your body balances and adjusts to the bounce, sway, and tilt of the ball, which engages your core and builds the endurance and strength of your postural muscles. The presence of a backrest impedes this process, compromising the health benefits of active sitting.
The Evolution Chair is purposefully designed without a backrest to provide optimum health benefits. The absence of a backrest forces you to balance and adjust to the bounce, sway, and tilt of the ball which engages your core to build endurance and strength of your postural muscles. Backrests defeat the purpose of strengthening your core and can actually weaken muscles.