To find out about upcoming clinics at Pengraig and elsewhere – click here

For individual PI sessions at Pengraig – book your session here

PI – our Posture Assessment Indicator – provides information on the rider’s position and balance as well as their rein contact

Sensitive sensors give continuous feedback of your weight distribution – whether you are sitting with equal weight in the Coronal plane (left and right), and the Sagittal plane (front and back).

This information together with photos/video footage of your position allows us to determine how far you are from the optimum.

Iterative adjustments can then be made to bring you closer to the optimum position.

Once your balance and alignment has been checked you can try measuring your rein contact. This year sees the introduction of rein sensors at the Olympic Games, and for the first time riders will be penalised for too strong a contact. Now you can see how you compare to the top equestrians and check if one of your hands is stronger than the other, how much your contact varies when rising to a trot and whether you throw the contact away after applying a half halt.

The pictures below show the initial rein contact – the pressure applied to the reins. This allows you to determine if your rein contact is equal, or if you favour one rein more than the other. The displays are coloured, blue is very little or no contact, green is contact, amber is beware that contact is becoming too heavy and red is much too hard a contact. The left display shows the contact in the left hand, the right display box shows the contact in the right hand and the middle box shows the discrepancy between the two.

Initial Rein Contact

Rein Contact after adjustment

Once the rein contact has been checked and adjusted at a halt, the rein balance can be measured at a rising trot. How does the left/right balance and front/rear balance change as you post.

The graph(s) show the minimum and maximum contact during rising trot. Ideally one should strive to have a consistent contact that doesn’t change during the rise and sit phases of the trot. In other words the min and max figures should not be significantly different. The yellow line represents the left hand and the black line represents the right hand. Ideally both hands should have the same contact.

The second graph shows how your left/right and forward/rear balance is affected as you post.

Rein Contact at a Rising Trot

Alternatively you can see how good you are at applying a half halt. Can you apply the half halt at the right moment in time and release the contact back to parity. What difference does it make if you use your back muscles or only your hands?

Finally you can try riding in our virtual ménage. This allows you to try using weight aids and body position to steer PI around a series of challenging ménage patterns. This enables you to determine how much reliance you place on your reins!

When you have mastered some of the patterns at a walk, see if you can maintain your balance and still apply the correct weight aid at a trot.

A report of your initial and adjusted positions along with screenshots of your virtual ménage session is produced and emailed to you.

Because of current COVID restrictions Posture Assessment sessions are restricted to individual sessions at Pengraig.

PI is a complex machine and is not easily transportable. However during normal circumstances we can bring PI to your yard for sufficiently large enough groups. We need certain facilities to be able to operate PI and these are listed below. Please note that the full range of features may not be available when PI is operated away from Pengraig. In particular if there is insufficient space the rear Coronal camera may not be utilised. See below for the space requirements necessary for each option.

Please note PI has a maximum height limit of 6’ 2” (1.87m) and weight limit of 15 Stone (95kgs).

PI is fitted with a standard deep seat GP saddle which is used for all PI Taster & group sessions.


Posture assessments for individuals on PI are only available at Pengraig.

Please note that a 45 min. session on PI only allows a brief taste of all of its capabilities. Depending on your initial posture and balance we may only have time for the initial measurement and corrections and to measure your rein contact at a halt. If you would like more extensive analysis and time to practice your weight aids in the virtual ménage we would recommend at least a one hour session.

At Pengraig

45 min PI Session £50 per person
60 min PI Full Session£60 per person
90 min PI Session£80 per person
45 min PI/45 min Own Horse £80 per person (inc day DIY stabling at Pengraig)
Other durationsPOA

Transportation of PI to your own yard is possible based on there being a minimum of 10 hours assessment(s).

PI takes approx. two hours to set up and calibrate on site and requires two people to operate fully. So in addition to the above prices, travel will be charged at 0.35p per mile and local accommodation for two people will be required for one or more nights (depending on duration of clinic).

Required Facilities for operating PI at your yard

Indoor clean room with flat and level solid floor – min. door aperture 75cm
Room must be accessible, on ground floor and near parking to facilitate unloading
Mains electricity (240V, 50Hz)
Good Lighting
Heating (during cold weather)
Secure facilities (as PI is left on the premises overnight)

In order to operate cameras we need a minimum space around PI of:

Upcoming Clinics

DatePlaceClinicMore Info
18/09/21Pengraig, Nebo, SY23 5LEPI AssessmentClick Here