Posture

When playing and singing, my posture must be correct in order to peform better:

For playing piano, I must sit up straight and by sitting not too close but not too far away from the piano to get the range I need to reach all the notes, my feet should be stable on the ground for easy access to the pedal, sit on front half of the bench, not all of it, hands should be rounded and fingers bent, elbows slightly higher than the keys and wrists should be loose and rounded like my hands.

For singing, chin should be about parallel to the floor, shoulders should be held back and down, with chest held high,but not in a strained position, abdomen should be flat and firm, held in an expandable position, hands should be relaxed and still at the sides, knees should be flexibly loose, and never locked, feet should be slighty apart, one slightly in front of the other, the weight of the body is slightly forward.  Things I could do o make sure I have the right posture for singing:

Stand up against a wall, placing heels, calves, buttocks, shoulders, and head touch the wall.

Place one hand on the abdomen while breathing, to ensure the abdomen is expanding and relaxed.

Shift the weight of your body forward until almost standing on tips of the toes. Try to establish a feeling of buoyancy.

Stand in a slouched position, then change to the correct position, noticing the difference between the two