Move slowly through a narrow range of motion. If such movements causes no pain, gradually reach for a wider range of motion. Add speed last and with care. Water Running . Keep your chest and head erect.
Shoulders are relaxed and down.
Knees lift to 90 degrees while the arms pull forward and back with no lateral movement. Hands are relaxed with the thumbs towards the sky. Pull the elbows back, each in it's turn, and touch each hand into an imaginary pocket. Don't lean to far forward, or you'll be a dog paddling. Simply lift the knee, then push the foot straight down behind you.