Just today I came across your question and it happens to be my
specialty to solve issues like yours. I am a PT and OMT II from Germany
and do what - in my opinion - really is fun: giving riding lessons and
integrating my professional knowledge and experience from working with
(not only) professional athletes.
That said, I would like to
give you both thumbs up for acknowledging that you have a problem. In
most cases I hear the horse, the equipment or the trainer is the
problem - the excuses are endless!!!
The answers you have gotten so far in this thread (and I did not
read everything thoroughly) have been mostly on the right track.
The
human body is very complex - you have muscles, bones, joints,
ligaments,
capsules, nerves, receptors and your central nervous system including
your brain. This all needs to be able to function together as efficient
as possible. The older you get the less adaptable your body becomes and
sometimes bad stuff happens, like injuries and stress and your body
starts compensating to deal with everyday situations. Eventually you
don't even feel anymore that something is off or crooked. But when
riding a horse symmetry and balance are absolutely necessary, it's
fundamental. Then we need core strength, flexibility and coordination.
Hearing your story - typically - (your case might be different but I would need to diagnose you) I
don't think your problem is not enough strength in you lower leg, since you do not
even need it's muscles for riding (your calf muscles need to be well
stretched and you need good proprioception in your ankle, but that's
about it). You probably lack strength around your hip and spine
(adductors, gluteus, inside rotators). Your hip flexor needs to be
stretched and also your proprioceptors are in need to be trained. Also
your better right side needs to be mobilized (made more flexible)
because it took over a lot for your week side (compensating).
Then
there is your spine that is eventually in need of some adjustment -
mobilization and strengthening depending on the situation of the
individual segment.
And last but not least your core strength
needs to improve, not just through simple sit ups, this would be wrong,
It's a little more complex and complicated so I am not even trying to
explain a training program here.
So, you see, if there would be a golden recipe (a simple
exercise) to fix a problem like yours, personal trainers and PT's would
not be needed anymore.
The good news is that you don't have to go
to a gym to train yourself for riding, you can do it easily at home. A
good PT or personal trainer can customize an exercise program for you
and your goals as long as they understand a little about that sport.
Other
than that, I suggest a lot of seat exercises on the lunge line without
stirrups and no reins concentrating on your weak left side not only in
canter but also in trot and walk.
If you or your trainer need some help to
understand certain connections feel free to contact me through my
website www.HealthyRiding.com. I would love to help you!