You can be strong in the gym and still get wrecked on a trail.
Most ankle instability isn't a strength problem — it's a timing problem. The ankle can't react fast enough when you step on an edge or root. These four drills fix that.
Step 1: Forefoot Walk + Heel Walk

10 yds on the ball of the foot — spring tall, no collapse. 10 yds on the heel — toes up, anterior shin loaded, controlled pace. 2 passes. 90 seconds. Do this before every trail session.
Step 2: Active Foot Hold Stand on one foot.

Tripod contact: big toe mound, pinky mound, heel. Arch active — not gripped, not collapsed. Hold 30 sec. Progress to eyes closed and perturbation holds.
When the foot communicates clearly, everything upstream responds better.
Step 3: Multi-Direction Lunge Matrix

Forward → Reverse → Lateral → Rotational → Crossover One round each direction, both legs, bodyweight only. Terrain doesn't move in one direction — your prep shouldn't either.
Step 4: Step Downs Stand on a step.

Lower the free foot slowly (3 sec). Stop before contact. Return. Watch for knee cave, ankle collapse, or torso pitch — each one tells you exactly where your deficit lives.
15-Minute Pre-Trail Circuit:

Forefoot Walk + Heel Walk — 2 x 10 yds each

Active Foot Holds — 3 x 30 sec/side

Lunge Matrix — 1 round, all directions, both legs

Step Downs — 3 x 8/leg
The mountains don't care how much you bench. Train for the terrain.