The sentence below,which relates to weight lifting, by the way. It deals with technique and performance when squatting with weights on the shoulders.
Неполная амплитуда движения вниз, не прохождение прямого угла.
Partial amplitude of movement down, does not pass at the right of the angle?
Why is угла genitive?
The next sentence in case it clears things more is:
Не прохождение прямого угла по техническим правилам считается ошибкой и попытка не может считаться удачной.
What angle are they referring to?
As always.. Thank you.