Myers, 55, has even resorted to anti-gravity yoga sessions with dance partner Karen Hauer to try to correct his posture.
He said: "I've spent 35 years sitting on a motorbike in the rain. It's not had too good an effect on my bones. Getting me to stand up straight was a major mission."
For tonight's show, the couple will be dancing a salsa to the track Cuban Pete, from movie hit The Mask.