How Do Our Muscles Use Power Safely During Rowing?

Our muscles use power safely during rowing when the big muscles of the legs and trunk start each stroke, and the smaller muscles finish it and steady the joints. Done in that order, the load is shared across the strongest parts of your body. Done out of order, force goes through muscles that can’t hold it for long, and you tire faster and may pick up niggles. If you have pain, or an existing injury, get it assessed by a GP or physio before you train through it, and stop if it gets worse.

How much each muscle group does

Stroke analysis by rowing biomechanist Valery Kleshnev, in this row2k feature, gives a useful picture of who does what.

Body segment	Share of stroke length	Average share of power	World-best rowers’ share of power
Legs	33%	43%	43%
Trunk	31%	33%	36%
Arms	36%	24%	21%

The arms cover over a third of the distance but produce under a quarter of the power. That’s the case for sequence in one row of numbers. Let the arms start early and you ask the smallest group to do the job of the largest.

The order on the drive is legs, trunk, arms. The recovery reverses it: arms away, trunk forward, then the legs bend. The glutes, quads and hamstrings produce most of the leg force, and the back and core pass it through to the handle. Our guide to rowing muscles and how to train them goes through each group, and rowing with weak legs shows how to build the part of the chain that starts the stroke.

Why a small split gain costs so much

Power is force multiplied by speed. On an erg, the monitor’s power figure follows a cube law: watts = 2.80 ÷ pace³, where pace is seconds per metre.

Split per 500m	Pace	Power
2:30	0.30 s/m	About 104 watts
2:15	0.27 s/m	About 142 watts
2:00	0.24 s/m	About 203 watts

Going from 2:30 to 2:00 takes 20% off your split but needs nearly double the power. That’s why chasing a split with arm and back effort alone doesn’t work for long. The extra watts have to come from the muscles that can supply them. Our article on whether it’s better to be leaner or stronger for rowing looks at why rowing rewards power.

Controlling the slowdown

Muscles don’t only shorten to create force. They also lengthen under load to slow a movement, which is called working eccentrically. On the recovery your hamstrings, glutes and trunk control your body coming forward to the catch, and at the front of the stroke they absorb the change of direction. At the finish, the back and shoulder muscles control the handle as it moves away.

A body that can produce force but can’t slow itself down will struggle with repeated strokes, especially when tired. In a 30-minute row at 20 strokes a minute, you make 600 changes of direction at the catch. A smooth recovery, roughly twice as long as the drive, means your muscles don’t have to brake hard on each one.

The muscles that steady the joints

The shoulder is a good example. It’s held in place by the four muscles of the rotator cuff: the subscapularis, supraspinatus, infraspinatus and teres minor. They keep the joint centred while the bigger muscles work. The muscles around the hips and the deep core do the same job for the pelvis and spine while the legs drive.

Glute bridges train the hips, and face pulls or band pull-aparts train the upper back and rear shoulders. Exercises like these are used in rehabilitation, and they suit healthy rowers too. As a rule of thumb, 2 or 3 sets of 10 to 15 slow reps, twice a week, is a sensible start.

A sensible order for building

Stage	What to do	Move on when
1. Control	Slow strokes at 18 to 20 a minute, attention on the recovery	The sequence stays in order for 20 minutes
2. Stability	Glute bridges, planks and rear-shoulder work, twice a week	You can hold good positions without shaking
3. Strength	Squats and hinges at moderate loads, heavier as technique allows	Your form holds on the last rep
4. Power	Short, fast efforts and explosive lifts	The first three stages feel solid

Plans often push one quality at a time, such as a block of steady work followed by a block with more strength or speed, because it’s hard to push both at once. Beginners can improve both together, since everything is new to them. Our guides to strength training for rowing and engine building show how each side is trained, and our article on whether it’s better to row fast or slow helps you decide what your next session needs.

Common faults and fixes

• Arms pull first. Row 20 strokes of legs-only, then add the trunk, then the arms.
• Back opens early. Keep the trunk still until the handle passes your knees. Our list of common rowing technique faults has more self-checks.
• Rushing the slide. Count “one” on the drive and “two, three” on the recovery.
• Rounding under load. Sit tall and hinge from the hips, not the lower back.
• One side sorer than the other. Tell a coach or physio. Thousands of strokes can magnify a small imbalance.

When you’re tired

Fatigue changes technique. When form collapses at the end of a long piece, drop the rate by 2 and ease the pressure. If the sequence doesn’t come back within a minute or two, finish easily. Build volume slowly, warm up with 5 to 10 minutes of light rowing, and remember that sharp or increasing pain is a reason to stop, not a test of toughness.