Heel slides are a gentle exercise where you lie on your back and slowly bend your knee by sliding your heel along a surface toward your body. They’re one of the most common rehabilitation exercises for rebuilding knee range of motion and strengthening the muscles around the hip and knee. Physical therapists frequently prescribe them after knee replacement surgery, ACL reconstruction, and other lower-body procedures, often starting within 24 hours of surgery.
What Heel Slides Do for Your Body
The primary goal of a heel slide is to restore knee flexion, meaning how far you can bend your knee. After surgery or injury, scar tissue, swelling, and muscle guarding can all limit that motion. Heel slides work against those restrictions in a controlled, low-impact way. They activate the muscles that bend your hip and knee while keeping the rest of your body supported on the floor.
Research on knee replacement patients found that those who did active heel slides had less pain, better functional scores, and improved proprioception (your joint’s sense of where it is in space) compared to patients who relied solely on a machine to move the knee passively. The heel slide group also regained the ability to do a straight leg raise sooner, and performed better on real-world tasks like rising from a chair and climbing stairs at their three-month follow-up.
Step-by-Step Instructions
You need a firm, flat surface. A bed works in the early days after surgery, but a yoga mat on the floor gives you more stability once you’re able to get down and back up safely.
Starting Position
Lie flat on your back with both legs extended straight. Keep your arms relaxed at your sides or resting on your stomach. Make sure your back is in a comfortable, neutral position. If your low back feels strained, you can place a small rolled towel under the curve of your spine.
The Movement
- Slide your heel toward you. Slowly bend the knee of your affected leg by dragging your heel along the surface toward your buttock. Keep your heel in contact with the surface the entire time. Move at a pace where you stay in control.
- Bend as far as comfortable. Go until you feel a firm stretch or mild discomfort at the front of your knee. You should not force through sharp pain. Hold this bent position for 2 to 3 seconds.
- Slide back to the start. Slowly straighten your leg by sliding your heel back to the starting position. Control the movement in both directions, don’t let gravity do the work.
Keep your foot pointed straight up toward the ceiling throughout the movement. Avoid letting your knee fall inward or outward, which shifts the stress away from where you want it. Breathe normally. A common mistake is holding your breath during the slide, which creates unnecessary tension in your trunk.
Sets, Reps, and Frequency
A typical starting prescription is 10 to 15 repetitions, performed 2 to 3 times per day. In early post-surgical rehab, your therapist may ask you to do shorter sessions more frequently (for example, 10 reps every few hours) rather than one long session. The goal is to accumulate bending time without overwhelming the joint.
As your range of motion improves, you can increase to 15 to 20 reps per session or add a longer hold at the end of each slide (5 to 10 seconds). Progress is usually measured by how many degrees of knee flexion you gain over time. Many post-surgical protocols aim for roughly 90 degrees of knee bend within the first week or two, though your specific target depends on your surgery and your surgeon’s guidelines.
How Much Pain Is Normal
Some discomfort during heel slides is expected, especially in the first days or weeks of recovery. Research on pain during therapeutic exercise consistently points to a practical threshold: pain up to about 4 or 5 out of 10 is generally acceptable during the exercise, as long as that pain settles back down by the time you do your next session. If you’re still more sore the following morning, or if you notice increased swelling the next day, you’ve pushed too far.
Sharp, sudden pain is different from the dull ache of a stiff joint being stretched. If you feel a sharp or stabbing sensation, stop the movement. Ease back to a range where the discomfort is tolerable and work within that range for the session.
Tools That Make It Easier
Friction is the biggest practical obstacle. On a bedsheet or carpet, your heel can stick and force you to work harder than necessary just to get moving. A few simple tools solve this.
A towel or pillowcase placed under your heel reduces friction on fabric surfaces and lets your foot glide more smoothly. You can also loop a long towel, belt, or yoga strap around the arch of your foot and hold the ends in your hands. This gives you a mechanical advantage: your arms can assist the bending motion when your leg muscles aren’t yet strong enough to do it alone, and they can help control the straightening phase on the way back. Wearing a sock on a hardwood or tile floor achieves the same low-friction effect without any equipment.
Variations for Different Stages
Assisted Heel Slides
If you can’t bend the knee far enough under your own power, use the towel-strap method described above. Your arms share the workload, letting you reach a deeper bend than the leg could manage alone. This is the most common version in the first few days after surgery.
Wall Heel Slides
Lie on your back with your feet up against a wall, knees bent. Let gravity slowly pull your foot down the wall, bending the knee further. Use your other leg to push the affected foot back up to the starting position. This variation is useful once you’ve regained moderate range of motion and want gravity to provide a gentle, sustained stretch at end range.
Seated Heel Slides
Sit in a sturdy chair with your feet flat on the floor. Slowly slide the foot of your affected leg backward under the chair, bending the knee, then slide it forward to straighten. This version works well for people who have difficulty getting down to the floor or who want to add heel slides into their daily routine at a desk or table.
Common Mistakes to Avoid
Lifting the heel off the surface turns a heel slide into a different exercise entirely. Your heel should stay in contact with the floor, bed, or wall throughout the movement. Lifting it adds hamstring and hip flexor demand that can cause compensatory movement patterns, especially early in recovery.
Rushing through reps is another common issue. The value of a heel slide comes from the controlled, sustained stretch at end range and the neuromuscular feedback your joint gets from actively moving through that range. Speeding through 15 reps in 30 seconds misses the point. Each rep should take roughly 4 to 6 seconds in each direction.
Finally, avoid hiking your hip up toward your ribs as you slide. This is a compensation your body uses when the knee itself won’t bend further. It feels like you’re getting more range, but the extra motion is coming from your pelvis, not your knee. Keep both hip bones level and pointed at the ceiling.