Windshield wipers are a core exercise where you lie flat, raise your legs, and rotate them side to side from the hips.
Whether you landed here hunting for the ab-building move or you’re actually trying to swap out the blades on your car, both versions of “windshield wipers” get covered below. For the exercise, you mostly need a mat, a flat floor, and a willingness to feel your obliques, while the car version needs a correctly sized replacement blade and about ten minutes. The good news is that neither one requires special skills, and the steps below walk you through each version from the very start.
What Are Windshield Wipers (The Exercise)?
Windshield wipers are a bodyweight core exercise that trains your obliques, lower abs, and hip flexors through a controlled side-to-side leg rotation. Your shoulders and upper back stay glued to the floor while your legs sweep like wiper blades, which is exactly where the move gets its name. It’s an intermediate-to-advanced movement because it demands serious core control to avoid arching your lower back.
Here’s the standard way to do it:
- Lie on your back with your legs straight up toward the ceiling and your arms stretched out to the sides in a T shape for balance.
- Press your lower back into the floor and engage your core by pulling your belly button toward your spine.
- Keeping your legs straight and together, slowly lower them to one side until they hover just above the floor. Don’t let them touch.
- Pause briefly, then sweep them back to center and lower them to the other side.
- That’s one rep — rotate legs to each side.
Shoot for 6–15 controlled reps on each side, resting 30–45 seconds between sets. If you feel your lower back arching off the floor, you’re going too low or moving too fast.
How to Do Windshield Wipers If You’re a Beginner
If the full leg-extension version strains your back or feels impossible to control, scale it down.
The bent-knee variation is the smart starting point. Lie on your back with your knees bent at 90 degrees and your feet flat on the floor. Let both knees fall to one side as far as feels comfortable, keeping your shoulders pinned down, then bring them back to center and drop them to the other side. This version barely loads the lower back and works as a gentle range-of-motion stretch that still lights up the obliques.
For an advanced option, you can do hanging windshield wipers from a pull-up bar. Hang with your torso lifted so your hips are flexed around 90 degrees and your legs hang straight down, then rotate your legs side to side in a controlled tempo. This is a serious strength move — only attempt it once the floor version feels easy.
The common mistakes to avoid are letting your lower back arch (keep it pressed into the floor) and swinging your legs with momentum instead of slow, deliberate control. If you feel sharp back pain, switch to the bent-knee version immediately.
How to Install Car Windshield Wipers
If “windshield wipers” actually means the blades on your vehicle, the replacement process takes about ten minutes and requires no tools for most cars. The old and new blades must be the same size, and the connector on the new blade has to match your car’s wiper arm hook. Ford’s official guidance says to check your Owner’s Manual for the exact part number that fits your vehicle.
The general steps work across most passenger vehicles:
- Park, set the parking brake, and turn the ignition off with the wipers switched off. For Ford vehicles specifically, you can turn the key to the on position (engine off), switch the wipers on, then turn the ignition off when the blades stand vertical — this puts both arms in service position.
- Pull the wiper arm away from the glass until it locks in the upright position. Support it with one hand so it can’t snap back onto the windshield.
- Rotate the old blade to access the connector, then squeeze the lock pin or tab and slide the blade off the arm hook.
- Remove any plastic protector from the new blade’s rubber.
- Push the new blade’s adapter onto the arm hook until it clicks into place. Confirm it’s aligned and not twisted.
- Gently lower the arm back onto the glass, then repeat on the other side.
- Ford. “How Do I Change My Windshield Wiper Blades?” Official steps for Ford vehicles, including service position and blade removal.
- TRICO Products. “How to Replace Your Windshield Wipers.” General installation guidance across vehicles.
After installation, test both blades with washer fluid at multiple speeds. A firmly locked connection is what prevents the blade from detaching at highway speed, so listen for that click. If a latch is stubborn, a needle-nose pliers or small flat-head screwdriver can help release it. The biggest mistake people make is letting the bare arm snap back onto the glass — that impact can shatter or crack the windshield.
Blade choice comes down to your car, your climate, and your budget. Conventional blades are cheap and standard, beam blades handle snow and ice well, and hybrid blades try to combine the strengths of both. If you’re shopping for a replacement set, our roundup of the best cheap windshield wipers covers tested budget-friendly picks that fit most vehicles.
FAQs
How often should I replace my car’s wiper blades?
Most manufacturers recommend replacing wiper blades every six to twelve months, or whenever they start streaking, chattering, or leaving gaps. If you live in a hot, sunny climate or use your wipers heavily, they’ll wear out faster. A quick test is to run your wipers with washer fluid — if they smear or skip, it’s time for new blades.
Will windshield wipers (the exercise) hurt my lower back?
The exercise can strain your lower back if you arch it or let momentum swing your legs. Keeping your lower back pressed into the floor and moving slowly prevents this. If existing back issues make the move uncomfortable, the bent-knee version is a gentler alternative that still engages your obliques through a safe, pain-free range of motion.
Do windshield wiper blades fit all cars?
No — wiper blades come in different lengths and connector types, and they have to match both your car’s wiper arm hook and the width of your windshield. Using the wrong size can cause streaking, poor coverage, or the blade detaching entirely. Check your Owner’s Manual for the correct part number or use a fitment tool when buying replacements.