Kick-Only Swim Set: Leg Strength Builder

Session Overview

This 45-minute kick-only swim session builds explosive leg power and ankle flexibility — two key drivers of freestyle propulsion that are often overlooked in standard pool training. It’s ideal for intermediate swimmers who want to improve their kick contribution and reduce reliance on arm pull alone.

What You’ll Need

• Kickboard (required)
• Pull buoy (optional, for rest intervals)
• Fins (optional — use to identify ankle flexibility issues)

Warm-Up (8 minutes)

Swim 200m easy freestyle focusing on a smooth, relaxed stroke. Then swim 4 x 25m with fins at easy effort, concentrating on ankle extension and flutter kick depth. Rest 15 seconds after each 25m.

Main Set

All sets performed with kickboard unless otherwise noted. Keep hips near the surface and aim for a tight, compact kick from the hip — not the knee.

• 4 x 50m kick with kickboard at moderate effort (65–70% effort), 20 seconds rest
• 4 x 25m kick sprint (90% effort), 30 seconds rest
• 200m steady kick (no board — arms stretched in front), easy-moderate pace
• 4 x 50m kick with alternating sides — 25m on left side, 25m on right side, 20 seconds rest
• 4 x 25m kick sprint to finish, 30 seconds rest

Cool-Down (5 minutes)

Swim 150m easy backstroke or easy freestyle, focusing on long, slow strokes and letting your legs relax completely. Finish with 50m of sculling on your back.

Coaching Notes

• Keep the kick originating from the hip, not the knee — a knee-driven kick wastes energy and creates drag
• Point your toes throughout — stiffen the ankle joint and think about pushing water backward, not downward
• Make it harder: remove the kickboard and use a clenched fist to eliminate arm assistance
• Make it easier: use fins for the sprint sets to reinforce good ankle extension before removing them
• Target RPE 6–8 on the sprint sets, RPE 4–5 on the steady portions