This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to hockey powerskate
Get into hockey posture.
Bend knees to a position where the lower part of the upper leg is perpendicular to the ice (90 degrees). Skates are shoulder width apart.

OPT:
--Keep eyes on one side of the board. Loop your left skate through your right arm.;
--The back is straight, and the chest upright. Bend at the hips, shoulders back, the upper body leaning forward (50 degrees), and hold your stick with two hands.;
--Your arms should be on the sides of your head. This posture should act as a push to the puck and/or not make you skate down flat.;
--To do a handstand, the blades of your skates should be facing each other. Stand with feet slightly wider than shoulder width apart.;
The answer is:
The back is straight, and the chest upright. Bend at the hips, shoulders back, the upper body leaning forward (50 degrees), and hold your stick with two hands.