How dangerous curling really is: real numbers on knee and back complaints, the technique errors behind them and a warm-up that actually protects you.
The honest answer: curling is a relatively safe winter sport — genuine time-loss injuries were estimated at about 2 per 1000 athlete exposures, roughly one in 500 training or match appearances [1]. You won't break anything here and nobody skates into you. That is the good part.
The honest second part: almost everyone still gets complaints. In the only larger survey of competitive curlers so far, 79 % reported musculoskeletal complaints — most often knee (54 %), back (33 %) and shoulder (20 %) — and the most frequent triggers were sweeping and the delivery [1]. Those are not accidents, that is overuse.
And overuse is the good news, because overuse is manageable. You need neither talent nor protective gear for it, just three things: sliding flat instead of on your toes, a long back instead of a hunch — and a warm-up that deserves the name. Physiotherapists who treat curlers put a large share of the complaints down to simply not warming up [4].
A quick reality check on load: the overall game is moderate, but the sweeping intervals are hard — in measurements, hard sweeping pushes the pulse into the region of 170 beats per minute [5]. Your body goes from the cold straight into an interval. That is exactly what the warm-up is for.
Start with five minutes of general warm-up — running on the spot, high knees, butt kicks, jumping jacks — until you feel slightly warm [4]. Then add dynamic, curling-specific movements for legs and trunk: deep lunges, hip circles, trunk rotation, shoulder circles [4]. Ten minutes, no equipment, no fuss.
The single most important knee protection in curling. Sliding on the ball of the foot (the "toe slide") produces more than double the knee joint force of a flat slide, because your weight tips forward over the knee and the lever arm of the ground reaction force grows [2]. As a beginner you slide flat. Full stop.
Back complaints in curling come mainly from the back rounding instead of staying straight during the deep lunge and the release [4]. Think "chest up, eyes on the skip's broom, hips back". You buy the depth from hips and knees, not from your lumbar spine.
Biomechanically the delivery is no random victim: it markedly raises peak hip abduction, knee flexion and the associated joint moments and relies on the coordinated work of the muscles for hip abduction, knee flexion and extension and external rotation [3]. Which is exactly why the research recommends targeted strength and stability training for hips and knees [3] — glute bridges, side abductions, split squats, a few minutes, twice a week.
Sweeping is the second most common source of complaints [1]. The fix is the same as for the delivery: pressure from body weight, trunk and legs instead of lumbar spine and wrists — and both feet in grippers so you don't slide into an uncontrolled position [6].
Three rules that apply on every sheet: the stone weighs about 20 kilos and stops for nothing — never grab it from the front, never put a foot in front of it. Never cross a sheet with a stone running on it. And always wear the gripper over the slider outside the delivery [6].
On warning signs, stay honest: sore muscles after sweeping are normal, a stabbing back pain or a knee that swells after every session is not. The typical zones are known — knee, back, shoulder [1][4] — and exactly there, early assessment beats gritting your teeth.
And fundamentally: this guide explains risks and motivates you, but never replaces a supervised course or medical advice. A coach sees in ten seconds whether your back is rounded — you never will.
Do your warm-up on the ice, in the delivery position. Instead of stretching by the boards: five times into the hack without a stone, deep into the sliding position, hold a few seconds, back up. That warms exactly the muscles about to work and instantly tells you whether your calves or hip flexors are tight today — the most common hidden reason beginners can't get low enough and compensate through the back [4]. Ten minutes of preparation beats ten weeks off.
No, not compared to other winter sports. Time-loss injuries were estimated at around 2 per 1000 athlete exposures and curling counts as a relatively safe winter sport [1]. What you can realistically expect are overuse complaints: 79 % of the competitive curlers surveyed reported musculoskeletal complaints, mainly knee, back and shoulder [1].
Usually because of two technique details. Sliding on the ball of the foot instead of flat more than doubles the knee joint force [2]. And a back that rounds instead of lengthening in the deep lunge puts the load into the lumbar spine [4]. Both are technique problems, not matters of fate.
With three building blocks: slide flat instead of toe sliding [2], keep a straight back in delivery and sweeping [4], and train hip and knee strength and stability on purpose, because the delivery loads exactly those joints [3]. Add mobility for calves, glutes and hip flexors so you can get low at all [4].
Yes — it is the single most effective measure. Physiotherapists put a large share of curling complaints down to missing warm-ups [4]. Five minutes general plus five minutes dynamic for legs, hips, trunk and shoulders is enough. The reason is simple: the overall game is moderate, but sweeping intervals push the pulse into the region of 170 beats per minute [5].
Delivering Consistently: Weight Control, Line and the Calm That Makes Your Stones Land