The 90/90 hip switch is a seated drill in which both knees are bent to ninety degrees, one hip in external rotation and the other in internal rotation, and you rotate through the middle to swap sides without using your hands. We use it before squat days for people whose hips are stiff enough to steal depth, because two minutes of it usually buys a deeper, more even goblet squat than any amount of cueing does.
It looks like a stretch and is coached like a strength exercise: slow, controlled, both sit bones down, trunk tall. This is mobility rather than flexibility, range you move yourself into. The rushed version, knees flopping side to side with the hands doing the pushing, trains nothing.
What it trains
Hip rotation in both directions, actively. The front leg sits in external rotation, the back leg in internal rotation, and the switch asks the muscles around the hip to move the joint through that range rather than gravity dragging it there. That matters because internal rotation is the range adults tend to lose first, and it is the range a deep goblet squat and a clean lateral lunge both borrow from. Done slowly it also teaches the trunk to stay upright while the hips move underneath it.
Setup
- Sit on the floor with the right leg in front, knee bent to ninety degrees, shin parallel to the front of your body. The left leg is out to the side, also bent to ninety, shin pointing behind you.
- Sit tall: both sit bones down, chest over the hips, hands resting on the shins or floating in front of you.
- Lift both knees an inch, rotate the hips through the middle so the feet stay roughly where they are and the knees swing to the other side, and settle into the mirror position with the left leg in front.
- Pause for a full breath at each end before switching back. Five to eight switches per side, slower than feels necessary.
The cues we use
- Both sit bones stay on the floor; if one lifts, you have left the hip and gone to the spine
- Knees lead, feet follow, hands stay out of it
- Slow through the middle: the switch is the exercise, not the position
Common faults, and the fixes
| Fault | Why it happens | The fix |
|---|---|---|
| Leaning back and rounding to get the knees down | The hip runs out of rotation and the lower back donates the missing range | Sit taller, let the knees float higher, and take the shorter honest range; the range grows over weeks, not within a set |
| Hands pushing the switch | The arms are stronger than the hip rotators and will happily do the job we wanted the hips to do | Hands to the chest or hovering; if the switch cannot happen without them, slow it down and shrink it rather than push |
| Feet dragging and momentum flicks | Rushing turns the drill into a rocking motion that skips the mid-range, which is where the hips are weakest | Lift both knees a little before rotating and count a slow three through the middle |
| A pinch at the front of the back hip | Internal rotation at end range can compress the front of some hips, especially when the trunk tips forward | Reduce the range, keep the trunk tall, and sit on a pair of stacked plates to open the angle; a pinch that persists or is sharp is a physiotherapist question, not a push-through-it question |
The ladder
Easier: Elevated 90/90 with hands behind — When the floor position rounds the back or the back hip pinches: sitting on a pair of stacked plates raises the hips, and the hands behind take enough load to let the hips move through a range they can own
Harder: Hands-free switch with holds and lift-offs — When eight slow switches per side are clean and unassisted: add a two-second hold at each end, then lift the back leg a few centimetres off the floor at the end of the switch and hold it there, which is where this stops being a stretch
How it is loaded here
Never loaded. The dose is reps and tempo: five to eight switches per side, each taking three or four seconds through the middle, once through in the warm-up on squat days and sometimes again between goblet squat sets for the people who lose their bottom position as the sets go on. In a group of eight it runs on the floor while the coach sets up the racks, so it costs the session nothing. If someone's squat depth changes visibly after two minutes of this, it stays in their warm-up for the block; if it does not, the two minutes go to the heels-elevated goblet squat instead, because the limit is probably ankles rather than hips.
When we swap it
- knees that dislike floor sitting: A standing version holding the rack with one hand, rotating the free hip in and out through the same range, keeps the drill without the floor
- a hip replacement history: Deep rotation ranges are a question for your surgeon or physiotherapist; until you have an answer, the squat warm-up uses the heels-elevated goblet squat and the reverse lunge instead
- hips that switch fine but squat badly anyway: The limit is probably ankles, not hips: the heels-elevated goblet squat answers that faster than more rotation work
Common questions
Why do coaches put this before squats?
Because hip rotation is what lets the knees track over the toes at the bottom of a squat, and most stiff squats are stiff in rotation rather than in the knees or ankles. Two minutes of controlled switching wakes that range up so the squat that follows starts deeper and more even from the first ramp set.
Why is one direction so much harder than the other?
Almost everyone has one hip that rotates in better and one that rotates out better, and daily habits such as which leg you cross or how you sit in the car make it worse. Note it, work the stiffer direction a little longer, and expect it to even out over a block rather than a session.
Should I do the 90/90 switch every day?
You can; it is unloaded and cheap. Most people get what they need from it on squat days plus a short evening round on the days they have sat the longest. Chasing range every day without loading the new range in a squat or lunge does not stick, which is why it lives next to the goblet squat rather than on its own.
