Prone back extension and Y raise (Trunk extension strengthening, arms in Y position, prone)

Lie face down with your arms in a Y" position diagonally up and away from you palms facing down.
Keep your head slightly elevated and neck long.
Lift your arms up and feel your shoulder blades moving towards your spine.
At the same time slightly lift your chest off the floor.
Then return to the starting position.
Perform this exercise in a slow controlled manner.