Juliette sits perfectly, her gently curving spine topping out in a relaxed and symmetric pair of shoulders. Her command of Pilates and physiology is constantly demonstrated by flawless execution - her movements are well-balanced and gracefully executed, a raised arm makes the the appropriate muscles move in a flowing and efficient melody.
Next to her my habitual slouching is magnified and I am made awkardly aware of my slumping back and taut shoulders. My frame sags into its seat, lazy muscles ceding support to the hard angles of the furniture. My body positions are wrong and my mind cannot shepherd the joints into the correct angles I enviously watch flow through her movements.
I'm trying to hold myself properly, hips and buttocks positioned just so, shoulder blades back and down, wrists held lightly above the keyboard, but a moment's inattention makes the wrong muscles tauten or soften and by the time I am next aware of my body my posture has failed me once more.