A proper squat involves lowering your body while keeping your back straight.
Una sentadilla adecuada implica bajar el cuerpo manteniendo la espalda recta.
He sat down with his back straight, ready to work.
Sit with your back straight and your feet flat on the floor.
Keep the back straight and stay close to the object being lifted.
Mantenga la espalda derecha y quédese cerca del objeto que está levantando.
Sit down on the floor, with your back straight and upright.
Try to have your back straight and supported on a cushion.
A proper back straight can reduce fatigue at your desk.
Tener una espalda recta adecuada puede reducir la fatiga en el escritorio.
The neck is of medium length, back straight and long.
El cuello es de longitud media, la espalda recta y larga.
Gently bend forward at the hip and keep your back straight.
Siéntate en la orilla de una silla, mantén la espalda recta.
Sit in a quiet place with your back straight, but relaxed.
Siéntate en un lugar tranquilo con la espalda recta, pero relajado.
One holds one's back straight, and stands with a swish.
Uno mantiene la espalda derecha y se para con un "swish".
In dance class, a back straight is necessary for elegant movements.
En la clase de baile, una espalda recta es necesaria para movimientos elegantes.
Instead, bend at your knees and keep your back straight.
En cambio, flexione las rodillas y mantenga la espalda recta.