Posture and Form

-Brahms Sonatensatz played by Jascha Heifetz

For all the musicians, posture and form are extremely important. It is because as all good teachers say and especially my former teacher says, "Power = Violin up, left elbow up!" If any violinist can't figure out what it means, check Jascha Heifetz's posture, form and bowing to playing this music perfectly. His bowholding is very relaxed, lightly holded, no tension on his arm, arm moves very straight, light touch on the strings but makes heavy, sticky, full sound and his bow figers move naturally, flexibly. The relaxation on his posture, I need to learn it!