You strikes land exactly where you mean them to.
Benefit(s): As a full-round action, you can expend 1 ki point or one daily use of martial flexibility to use a limited version of the targeted strike deed, targeting either hands or legs with an unarmed attack. A target who succeeds at a Fortitude save (DC = 10 + your base attack bonus) can negate the effect. When your base attack bonus reaches +11, you can instead target head or torso, which the target can negate with a Fortitude save.
When your BAB reaches +16, you can target two locations; the target must save against each effect separately.
Pathfinder Player Companion: Martial Arts Handbook © 2018, Paizo Inc.; Authors: Thurston Hillman, Mikko Kallio, Jacob W. Michaels, Matt Morris, Daniel Reed, Mikhail Rekun, Mark Seifter, and Jeffrey Swank.