This video covers the Combat Base Ankle Dorsiflexion (DF) PAILs/RAILs - a drill designed to improve ankle dorsiflexion range and, more importantly, your ability to control and tolerate that range under load. Dorsiflexion matters because it heavily influences how you squat, lunge, run, and land. When DF is limited, you’ll usually see compensations like heels lifting, feet collapsing, knees caving, or extra motion through the knee, hip, or low back. Building DF capacity helps your lower body move cleaner, feel stronger, and stay more resilient over time.

The sequence (repeatable for sets or reps):
1. Passive stretch (~2 minutes): settle into the combat DF position or variation and breathe, finding your best alignment while the tissues adapt.
2. PAILs (progressive isometric contraction): gradually ramp tension out of the stretch, gas-pedalling the floor to create the intended stimulus for the day.
3. RAILs (regressive isometric contraction): reverse the intent and actively pull deeper into the newly available DF range with controlled effort.
4. Sink into the new range: ease off slightly and move into the range you just earned.
5. Repeat for additional rounds if you’re doing multiple sets.

Programming note: The iso duration, intensity, and total time under tension should match your goal - lighter/shorter for prep and skill work, heavier/longer for strength and adaptation.

Regressions and comfort options:
• If the combat base feels uncomfortable, start by adding blocks to change the height and reduce the demand while keeping the position clean.
• If it still doesn’t feel right, shift to a half-kneeling dorsiflexion setup first, then progress back toward collapsed combat as tolerance and range improve.
The goal is a strong stimulus without pain or forced positions.