Comfort is Key to Guitar Posture

It's fine to play the guitar in an informal cross-legged posture, as long as you are not straining to reach the strings and you keep your shoulders relaxed. Painting of Paco de Lucia by Innesa Orlik.

Most people play rock, pop and folk guitar supporting the instrument on their right leg. Classical guitar and some jazz players use the left leg approach with the left foot elevated on an adjustable foot stool. There are advantages to each approach but they are inevitably personal choices.

Comfort is the primary consideration so it’s a good idea to try both. I have always used a variation of the two styles, ie., guitar on the right leg but elevating my right foot on an adjustable stool.

The size of the guitar body can be a factor. If the body of the guitar is too big for your arm, the left leg and elevated foot is a good choice. It takes pressure off the right arm and makes the strings easier to reach. No matter how you sit, avoid raising your shoulders. That only puts pressure on your neck and causes shoulder fatigue.

It’s fine to cross your legs while sitting as long as you remain comfortable physically and can reach the neck and strings easily.