Windshield Wiper: A Complete Guide
Quick Intro
The Windshield Wiper is a dynamic stretch performed lying on the back with both knees bent and the feet flat on the floor, arms extended out to the sides for a stable base. Letting both knees fall together toward one side and sweeping them back across to the other is what gives the drill its name and its rotational stretch through the hips and low back.
Equipment Needed
No equipment is required. A yoga mat is optional, mainly for comfort lying on a hard floor.
Why It Matters
The drill is built around controlled rotation through the hips and low back rather than one muscle’s raw range. Moving both knees together as a single unit asks the trunk to actively control the sweep, not just release into it, and letting momentum take over is the easiest way to lose that control. It works well as gentle spinal and hip mobility either early in a session or as a calming way to close one out.
When to Do It
This fits well early in a floor-based mobility routine or as a low-intensity way to end a session. Anyone with a diagnosed lower back or disc condition should get clearance from a doctor or physical therapist before adding rotational movement through the spine.
Getting Ready
The hips and low back don’t need dedicated warming up before this drill, since the motion is slow and small from the very first rep. A couple of short, low-range reps first help find the point where the shoulder blades start to lift, which marks the edge of a controlled range for the day.
Step-by-Step Instructions
- Lie on your back with both knees bent and feet flat on the floor.
- Extend both arms out to the sides for a stable base.
- Slowly let both knees fall together toward one side.
- Sweep the knees back up and across to the other side.
- Continue alternating sides for the full set.
How Many, How Often
| Level | Reps (both directions) |
|---|---|
| Beginner | 8-10 |
| Intermediate | 10-12 |
| Advanced | 12-15 |
Keeping both shoulder blades on the floor throughout matters more here than how far the knees travel. Dropping the knees with momentum takes away the trunk-stability benefit this drill is meant to build.
Modifications and Variations
Harder: Windshield Wiper — Legs Extended. Straightening both legs during the sweep considerably increases the lever arm on the obliques and hips, raising the flexibility and coordination demand well above the bent-knee version.
Common Mistakes to Avoid
Letting the shoulder blades lift off the floor. This is the clearest sign the range has gone past what the hips and low back can control from the trunk. The knees should stop wherever the shoulders start to peel up, not wherever they naturally want to fall.
Dropping the knees with momentum instead of control. Momentum bypasses the exact rotational control this drill is meant to build, turning a controlled mobility drill into a passive flop.
Rushing through the reps. A fast sweep skips past the moment where the hips and low back are working to control the fall. Slowing down builds more usable rotation than speed does.
After Your Set
A gentle knee-to-chest hug, pulling one knee toward the chest with both hands, finishes easing the hip this sweeping motion just worked.
Going Deeper
The marker of progress here isn’t how far the knees reach toward the floor, it’s whether the shoulder blades stay planted the whole time. Once that holds steady on both sides, the legs-extended version offers considerably more rotational range to work with. Chasing floor contact before the shoulders stay down usually just trades control for a few extra inches.
How to Know You’re Improving
- The shoulder blades stay flat on the floor through the entire sweep.
- The knees fall under control, not momentum.
- Both sides reach a similar range.
- The movement feels smooth at the transition point.
- The legs-extended version starts to feel like a reasonable next step.
Muscles Worked
- Obliques (the muscles along the sides of the abdomen, controlling the rotation)
- Erector Spinae (the muscles running along the length of the spine, working to control the sweep)
- IT Band and Tensor Fasciae Latae (a band of connective tissue down the outer thigh and the hip muscle that tensions it, stretching as the knees fall)
- Gluteus Medius (a smaller glute muscle at the side of the hip, stabilizing through the rotation)
- Multifidus (a set of small deep spinal muscles, helping control the movement segment by segment)
FAQ
Why does keeping the shoulder blades on the floor matter so much? Once the shoulders lift, the rotation is coming from the upper back instead of the hips and low back, which is a different movement than this drill is meant to train. Stopping the knees before that point keeps the stretch where it belongs.
Is it normal for one side to feel tighter than the other? Yes, a side-to-side difference in hip and low back rotation is common and often shows up clearly in this drill. Noticing it is one of the benefits of doing the movement regularly.
Should the feet stay on the floor? Yes, in this version. The feet stay planted and roll onto their edges as the knees fall, which keeps the movement small and easy to control. Lifting the feet makes the legs a longer lever and belongs to the harder versions.
How wide should the feet be? About hip width, or a little wider. A wider stance lets each knee drop further inward and brings more hip rotation into the sweep, while feet together turn it into more of a low back twist.
Can this be done first thing in the morning? Yes, the slow, low-range nature of the movement makes it a reasonable choice even on a stiff morning back. Keeping the range conservative for the first few reps is a sensible way to ease into it.
Is this safe with a sensitive lower back? For general stiffness it’s usually fine, but anyone with a diagnosed disc or lower back condition should check with a doctor or physical therapist before adding rotational spinal movement. Reducing the range and reps is a reasonable starting adjustment either way.
How is this different from the legs-extended version? Straight legs create a much longer lever arm on the obliques and hips, so the same side-to-side motion becomes considerably more demanding. Most people are better served mastering the bent-knee version’s control before adding that extra range.
Related to Windshield Wiper — Legs Extended, the harder straight-leg version.