Fast feet side to side is a quick footwork drill across a low step. You stand beside the step with one foot on top and the other on the floor, then swap feet so your body crosses over the step, and keep switching back and forth at speed. It works the calves and the muscles around the hips and knees, and it teaches you to place your feet quickly and accurately. Physios tend to add it in the later stages of ankle or knee rehab, or use it as a warm-up for sport.

How to do the fast feet side to side

Set a low, sturdy step that cannot slide on a clear floor, and stand side-on to it so the step is next to one foot. Have a counter or rail within reach the first few times.
Put the foot nearest the step on top of it. Your other foot stays on the floor, with your weight shared between the two.
Swap feet in one quick move: the floor foot comes up onto the step while the step foot drops to the floor on the far side. Your body passes over the step as you switch.
Switch straight back the other way, and keep going side to side. Stay light on the balls of your feet, and let each knee land in line with your second toe.
Begin at a steady pace and speed up only while every foot lands squarely on the step. This is a quick step, not a hop, so one foot touches down just as the other leaves. Keep your chest up and your arms moving loosely, as in the video.

What you should feel

Your calves working hard and your breathing picking up, with some effort at the front of the thighs and the sides of the hips. Your feet should feel quick and light rather than heavy.

Common mistakes

Watching your feet the whole time, which pulls your chest forward.
Letting the knees fall inward as you land.
Going faster than your footing allows, so a foot clips the edge of the step or half misses it.
Hopping or jumping across the step instead of stepping. Keep the switch low and controlled.

How often

Many programs use 3 to 5 bursts of 10 to 30 seconds, with 30 to 60 seconds of rest between them, a few times a week. Your physio will adjust this, including the step height and speed.

Stop and check with your physio if

Chest pain or pressure, dizziness or feeling faint, a racing or irregular heartbeat, or being far more out of breath than the effort should cause.
A sudden pop or snap at the back of your ankle or heel, a feeling that someone kicked you there, or sudden pain there after which you cannot push off or rise onto your toes on that leg. Stop, take the weight off that leg carefully and go to an urgent care center or emergency department the same day, even if you can still walk, as this can be a torn Achilles tendon.
Sharp pain in the ankle, knee or hip, an ankle that feels as if it could roll, or you catch the step or feel close to falling.

From the clinic

The man in the video works barefoot with nothing to hold, which is fine if you are already steady and sure-footed. At home, set the step beside a kitchen counter or use the bottom stair with a rail, clear the floor around it, and learn the pattern at walking pace before you add speed. Wear flat shoes that fit well and grip the floor, not socks, tights or bare feet. If you have fallen in the past year, feel unsteady on your feet or have osteoporosis, keep a hand on the support and ask your physio whether this drill is right for you yet. If you are pregnant, ask your midwife or physio before you try it, as your balance changes as your bump grows.

Side stepping and slow step ups are easier ways to get used to moving on and off a step, and fast feet forward and back is the same idea done facing the step. After an ankle fracture or ankle surgery, follow your surgeon's or physio's weight-bearing plan, and start this exercise only when they have cleared you. After a knee fracture or knee surgery, including a knee replacement, follow your surgeon's or physio's plan, and start this exercise only when they have cleared you. If you have had a hip replacement, get the go-ahead from your surgeon or physio before you try fast feet side to side. Some operations limit this kind of work for the first months, so the timing depends on your surgery.

This drill raises your heart rate quickly. With a heart condition or high blood pressure, check with your doctor before you start. If chest pain, pressure or tightness does not ease quickly when you rest, spreads to your arm, neck, jaw, stomach or back, or comes with sweating, feeling sick, feeling light-headed or being short of breath, call emergency services straight away, as this can be a heart attack. If it eases quickly and none of these happen, get medical advice the same day, and do not exercise again until you have been checked. If you faint while exercising, call emergency services, even if you feel fine again quickly.

Written and checked by the PocketPhysio editorial team. Last updated 2026-09-26.

This page is general education, not a diagnosis or a personal treatment plan. If you have pain, an injury or a health condition, see a physiotherapist or doctor before starting new exercises.

Fast feet side to side