Paddling is a full-body workout that primarily targets your back, shoulders, and core, with your arms contributing less power than most people assume. Whether you’re in a kayak, canoe, or on a stand-up paddleboard, the large muscles of your trunk do the heavy lifting while smaller muscles in your arms, forearms, and shoulders handle control and stabilization. Here’s a breakdown of every major muscle group involved and how each one contributes to the stroke.
Back Muscles: Your Primary Power Source
The latissimus dorsi, the broad muscle that fans across your mid and lower back, is the single most important muscle in paddling. It controls shoulder extension and internal rotation during the pull phase of each stroke, which is where the majority of your forward propulsion comes from. When you plant the blade in the water and drive it backward, your lats are doing the bulk of that work.
The trapezius, spanning from your neck to your mid-back, works alongside the lats to control your shoulder blade position and stabilize the shoulder joint throughout the stroke. Together, these two muscles form the engine of your paddling power. Experienced paddlers consciously focus on engaging their lats and core rather than pulling with their arms, which lets them paddle longer without fatigue.
Core and Trunk Muscles
Your core does more than just “help out” during paddling. It’s central to generating and transferring power from your torso rotation into the paddle. Research published in the Journal of Human Kinetics found that faster kayakers actively contract their external obliques and rectus abdominis to stabilize the lower trunk during each stroke. Specifically, the oblique on the same side as the stroke fires to limit excessive rotation, while the abdominal muscles on the opposite side brace to keep the lower body steady. This stabilization is directly linked to higher peak and average boat speed.
Think of it this way: your torso is a coiled spring. Your obliques and deep abdominal muscles control how that spring unwinds, channeling rotational energy into the paddle rather than letting it dissipate through sloppy movement. The rectus abdominis (your “six-pack” muscle) also activates throughout the stroke cycle, and EMG studies show it stays engaged during both high-intensity sprints and longer endurance efforts. Your lower back muscles, particularly the erector spinae group, work constantly to keep your spine upright and resist the forward pull of the paddle.
Shoulders and Rotator Cuff
All three portions of the deltoid (front, middle, and rear) are active during paddling, making it an effective shoulder workout. The front deltoid helps drive the paddle forward during the reach phase. The rear deltoid assists during the pull. EMG data shows that deltoid activity increases significantly during high-intensity sprints compared to steady-state paddling, meaning harder efforts demand more from your shoulders.
Less visible but equally important are the rotator cuff muscles, which stabilize the ball-and-socket joint of the shoulder throughout every stroke. These small muscles prevent the head of your upper arm bone from shifting upward when the larger deltoid contracts. The serratus anterior, a muscle that wraps around your ribcage beneath your shoulder blade, plays a key role in protracting (pushing forward) the shoulder blade during the reach and catch phases. Because it’s working almost continuously throughout the stroke cycle, the serratus anterior is particularly prone to fatigue during long paddling sessions.
Arms: Less Power Than You’d Think
Your biceps and triceps are active during paddling, but their role is more about control than raw power. The biceps engage during the pull phase, but not to yank the paddle backward. Instead, they resist excessive elbow extension, keeping your arm in the right position while your back and core do the actual pulling. The triceps fire on the opposite side, stiffening the pushing arm so it can effectively transmit force into the top of the paddle shaft.
This is why experienced paddlers often say “paddle with your core, not your arms.” Relying too heavily on your biceps leads to early fatigue and less efficient strokes. That said, your arms still get a solid workout, especially during longer sessions or sprints where muscle activation across all upper limb muscles ramps up significantly.
Forearms and Grip
Gripping the paddle shaft for extended periods places constant demand on your forearm muscles, particularly the wrist flexors and extensors. These muscles control your wrist angle and keep the paddle oriented correctly through the water. The position of your forearm (whether it’s rotated palm-up, palm-down, or neutral) changes which forearm muscles work hardest. During a typical paddling grip, the wrist flexors on the inside of your forearm stay moderately active to maintain your hold, while the extensors on the outside help stabilize the wrist joint.
If you’ve ever finished a long paddle with aching forearms, this is why. Grip fatigue is one of the most common complaints among recreational paddlers, and it’s often the first muscle group to give out on longer trips.
How the Stroke Phases Break Down
Each phase of the paddle stroke emphasizes different muscles:
- Catch (blade enters the water): Your core and hip rotate forward as a unit to extend your reach. The serratus anterior and front deltoid drive the shoulder blade and arm forward. The key here is that the reach comes from rotating your torso, not from extending your arm.
- Power phase (pulling through the water): Your lats, core, and hips generate the force. The biceps stabilize the pulling elbow. The opposite arm’s triceps push the top of the paddle shaft forward. Your obliques and rectus abdominis brace your trunk.
- Exit and recovery (blade leaves the water): Muscle tension drops briefly as the blade exits. Your body rotates forward on the opposite side to set up the next catch. This is the only rest period in continuous paddling, and experienced paddlers consciously relax during this phase to conserve energy.
Stand-Up Paddleboarding Adds Leg Work
If you’re paddling while standing on a SUP board rather than sitting in a kayak or canoe, the muscle demands shift considerably below the waist. Balancing on an unstable surface forces your legs to work constantly. Your quadriceps, hamstrings, glutes, and the smaller stabilizer muscles around your ankles, knees, and hips all engage to keep you upright. Your deep core muscles also work harder on a SUP compared to seated paddling because maintaining equilibrium on a floating board demands continuous trunk stabilization that a kayak seat doesn’t require.
The upper body demands remain similar to other forms of paddling, so SUP effectively turns a back-and-core workout into a true full-body session.
Single-Blade Canoeing and Muscle Imbalance
Canoeists using a single-blade paddle face a unique challenge: asymmetrical muscle development. Because you’re paddling predominantly on one side, the muscles on your dominant stroke side get worked harder and differently than the opposite side. Research on competitive canoe athletes found that women showed 20% to 29% lower paddle forces on their off-side strokes compared to their on-side strokes, reflecting meaningful strength imbalances between sides.
Interestingly, male canoeists showed more symmetrical forces between their on-side and off-side strokes, which may explain why female athletes tend to use more switching techniques (alternating paddle sides) during races. If you paddle a canoe recreationally, switching sides regularly helps keep muscle development more balanced and reduces the risk of overuse injuries on your dominant side.