If Something Isn't Working, You Have the Power to Change It
I love that joke where a man goes to the doctor with the complaint, "It hurts when I do this," and the doctor says, "Stop doing that, then." Sometimes it really IS that simple. If it hurts when you practice a pose a certain way... change the way you're practicing it. If your co-worker is bringing you down with his constant negativity, you have the power to change the way you relate to that co-worker.