Alias · Top Positions
Pre-armbar mount defence
Also known as S-Mount — Bottom — the canonical term used on this site.
Training background: functional description
Descriptive — defending before the S-mount armbar
Pre-armbar mount defence is a descriptive name for the S-mount bottom position — naming the defence in the window before the armbar finishes.
Etymology. “Pre-armbar” marks the moment, after the S-mount is set but before the armbar extends; “mount defence” frames the bottom player’s job. The label names the position by the narrow window it offers to defend.
Mechanics. The defence must act before the isolated arm is loaded past the elbow’s range: hiding the arm and turning in keeps the joint short of the danger point, since once the attacker extends the trapped arm against the hips the elbow reaches its limit fast. Defending early, before the load builds, is what keeps the arm safe.
Cross-reference. “Under the leg-over mount” is a sibling alias. Full mechanical coverage on S-Mount — Bottom.