The Drive: Legs, Back, Arms and Where Boat Speed Actually Comes From

Definition

The drive is the power phase of the rowing cycle. It begins the instant the blade is fully buried at the catch and finishes when the spoon lifts out of the water at the finish. Through those few seconds the rower's force passes from legs into back into arms, through the handle, down the loom, into the blade, and the blade levers against the water to accelerate the hull.

The drive is the only propulsive phase in the cycle. During the recovery the blade is clear of the water and the hull coasts forward on the momentum built in the previous drive. Nothing in the recovery adds speed. Every metre the crew ever travels comes from what happens between bury and extraction.

The drive sequence

Legs, back, arms - in that order, every stroke, every rate:

• Legs: from the compressed catch position the legs extend and push the seat back along the slide. The trunk stays pivoted forward and the arms stay long throughout this opening phase.
• Back: as the legs near full extension, the back begins to swing - from forward lean through upright into the layback position. The arms are still long.
• Arms: only at the end of the stroke do the elbows bend to draw the handle into the lower ribs. Layback is set, legs are flat.

Running the sequence out of order wastes the contribution of each muscle group. The legs are the largest and strongest muscles in the human body and they need to do the majority of the work. The back and arms finish what the legs started - they cannot rescue a failed leg drive no matter how hard they pull.

Power profile

The most efficient power profile is front-loaded - peak force at the catch when the hull is at its slowest and the blade has the deepest grip on the water, tapering as the boat accelerates through the drive. Hamish Bond and Eric Murray, who dominated the men's pair from 2009 to 2016 with seven undefeated seasons culminating in Olympic gold at London 2012 and Rio 2016, were textbook front-loaded drivers. The early catch pressure is the signature characteristic of the New Zealand heavyweight tradition.

Developing rowers usually show the opposite - a back-loaded profile where they pull hardest through the middle of the drive and into the finish, when the blade is shedding hold and the boat is already moving. Coaches use force-curve readouts from instrumented oarlocks (Empower Oarlock, Active Tools) to show rowers exactly where in the drive their pressure is landing and how to move it forward toward the catch.

Drive-recovery ratio

At base training rates (18-22 spm in UT2 aerobic work) the recovery lasts two to three times longer than the drive - a 1:2 to 1:3 ratio. That extended recovery gives the hull time to run and the rower time to set up the next catch cleanly. At 2km race pace (36-40 spm) the recovery compresses sharply and the ratio approaches 1:1.

The crews who maintain a deliberate recovery at race rate consistently beat the ones who collapse it. Rushing back to the catch shortens boat run, breaks balance and forces a hurried, weak entry. The erg pace calculator converts split into wattage so coaches can match what the boat is doing to what the body is producing, and most ergometers display drive and recovery times separately so rowers can track the ratio on the screen during long pieces.

Common drive errors

Drive errors waste more boat speed than any other fault. The four that coaches at Karapiro and at every other major NZ training venue spend the most time fixing:

• Shooting the slide: the legs straighten before the back has begun to swing. The seat arrives at the backstop before the handle reaches the body. Leg power is disconnected from the boat.
• Opening the back early: the back swings upright before the legs have nearly finished. The two muscle groups compete for the same window of time and both lose power.
• Bending the arms early: the elbows break during the leg drive. The arms shorten the lever, and the back has to work against an already-compromised arm position.
• Back-loaded power: maximum force is applied at the finish rather than the catch. The blade has least grip when the boat is fastest, so late pressure goes where it does the least work.

Drive at different stroke rates

The drive sequence and power profile should stay constant across every rate the crew uses. What changes with rate is the recovery: at low rates there is ample time between strokes to reset and build into the next catch, at high rates the recovery is compressed and the sequence must execute faster without skipping steps. Rate ladders - paddling through 18, 20, 22, 24 spm in sequence on a winter morning at Lake Karapiro - drill the LBA pattern until it is automatic from warm-up paddle through to the sprint at the line.