The moderate dose

Yes — rowing-type motions (including kayaking to a degree) are often considered an excellent counterbalance to racquet sports because they emphasize many of the opposite muscular actions and postural patterns.

Racquet sports heavily emphasize:

• anterior chain dominance (front-side muscles),

• internal shoulder rotation,

• forward shoulder posture,

• asymmetrical trunk rotation,

• repeated acceleration/deceleration of one arm.

The overused areas are commonly:

• pectorals,

• front deltoids,

• forearm flexors,

• dominant-side trunk rotation patterns.

Rowing motions shift emphasis toward the posterior chain:

• lats,

• rhomboids,

• middle/lower trapezius,

• rear deltoids,

• spinal stabilizers,

• glutes and hip hinge support (more in full rowing than kayaking).

So yes, rowing generally develops the “back side” more than the “front side,” especially compared with tennis or pickleball.

A simplified comparison:

Movement

Dominant emphasis

Tennis serve/forehand

chest/front shoulder/internal rotation

Pickleball quick volleys

anterior shoulder + forearm stabilization

Rowing stroke

scapular retraction + lats + posterior shoulder

Kayak paddling

rotational core + lats + upper back endurance

This is one reason rowing machines are often recommended for racquet athletes:

• they encourage scapular retraction (“opening” the chest),

• strengthen postural muscles,

• and may reduce shoulder imbalance risk.

But there is nuance:

• Kayaking is rotational and somewhat asymmetrical compared with true rowing.

• Very high-volume rowing without mobility work can also tighten the lats and shoulders.

• Racquet sports are explosive and elastic; rowing is more cyclical and endurance-oriented.

Your combination actually has good complementarity:

• swim = mobility + symmetrical endurance,

• gym = targeted support,

• kayak = posterior-chain endurance and rotational balance,

• racquet sports = speed, timing, elastic power.

That may partly explain why your body responded with:

• less leg stiffness,

• relaxed ball returns,

• and improved blocking/control sensations in pickleball.

The nervous system often performs better when the posterior chain and scapular stabilizers are adequately conditioned because the shoulder becomes a more stable “platform” for fine racquet control.

One caveat: too much kayaking/rowing volume right before tennis can occasionally reduce racquet “snap” temporarily because the lats and forearms become fatigued. Moderate doses usually complement racquet play well.