Denver Broncos cornerback Patrick Surtain II trains on sand in a session built around agility and the full range of movement demands a cornerback faces on the field. The unstable surface adds resistance to every cut and change of direction, sharpening balance, footwork, and quickness in ways that carry over to coverage situations. Jamal Liggin of JLT Performance builds this style of beach based agility training for defensive backs who need elite level change of direction and body control.