The same sandbag works for a U12 player and a U18 player. The weight, the exercise selection, the volume, and the complexity differ. The underlying principle — master the movement before adding load — stays constant regardless of age.
U12–U14: Foundation Phase
At this age, the goal is not strength. It's learning how to move under load — carrying, squatting, and hinging with weight attached — so those patterns are established before the body is ready to adapt to heavier training.
Approved movements for U12–U14:
Sample U12–U14 Session
Warm-up: 5 min movement prep (hip circles, leg swings, world's greatest stretch)
A: Zercher Carry × 3 × 20m — rest 60s
B: Bear Hug Squat × 3 × 10 reps — rest 60s
C: Shoulder Carry × 2 × 20m each side — rest 60s
D: Lateral Drag × 3 × 6 each side — rest 60s
Total: approximately 22 minutes
U15–U16: Development Phase
At U15–U16, the physical development window opens significantly. Players can now handle progressive overload and begin training the hip hinge and single-leg patterns that directly drive sprint speed and change-of-direction ability.
New movements added at U15–U16:
Sample U15–U16 Session
Warm-up: 5 min (hip circles, leg swings, bodyweight glute bridge)
A: Clean to Shoulder × 3 × 4 each side — 90s rest [POWER — do first]
B1: Sandbag Deadlift × 3 × 6 / B2: Zercher Carry 20m — superset, 90s rest
C: Sandbag Split Squat × 3 × 8 each leg — 60s rest
D: Lateral Drag × 3 × 8 each side — 60s rest
Total: approximately 32 minutes
U17–U18: Performance Phase
U17–U18 players have (or should have) 2–3 years of movement training behind them. The full sandbag movement library is available. Progressive overload every 2–3 weeks, power movements first in every session, and genuine strength targets drive adaptation at this stage.
Full movement library available at U17–U18:
Sample U17–U18 Session
Warm-up: 5 min dynamic prep + activation
A: Clean to Shoulder × 4 × 5 each — 90s rest [POWER]
B1: Sandbag Deadlift × 4 × 5 (heavy) / B2: Zercher Carry 25m — 90s rest
C: Bulgarian Split Squat × 3 × 6 each — 60s rest
D: Rotational Throw (wall) × 3 × 5 each — 90s rest
E: Lateral Drag + Overhead Slam (finisher) × 2 rounds
Total: approximately 42 minutes
The Rule That Applies at Every Age
Form breaks → reduce load. Full stop. There's no age group that earns the right to move poorly. A U18 player grinding through a 45-lb squat with a collapsing torso and caving knees is doing less useful training than a U12 player carrying 12 lbs in perfect Zercher position. Load is the last variable to change. Position, control, and pattern quality come first.