Amain

бы́стро

býstro

(at full speed)

и́зо всех сил

ízo vsex sil

(with all of one’s might — see also mightily, forcefully)

на полной скорости

na polnoj skorosti

(at full speed)

си́льно

sílʹno

(with all of one’s might — see also mightily, forcefully)

сломя голову

slomja golovu

(at full speed)