This is because this extension exercise works the opposite muscles to the curl exercise, thereby creating balance and great posture for the lower body. (mystrengthtraining.com)
Great posture on the bike isn't just for safety; it'll allow you to get the most bang for your buck during that 45 - minute sweat session. (mindbodygreen.com)
Your body will thank you when you're standing tall at 90 and someone comments on how great your posture is. (mindbodygreen.com)