Originally Posted by GotaDunQH
^ what she said. And also this other horse may not have been trained the "leg" does not ALWAYS means just go faster. You should be able to lay a leg into a horse without them shooting forward or going faster. If it happens, it means the horse has not been trained correctly to the leg...yet.
I'm going to differ with you there just a little.
It matters WHERE the legs are applied.
At least for the kind of riding I do......
Leg at the girth: more impulsion (go faster)
Leg behind the girth: get your hinds away from my leg.
Then you can combine them into different mixes (plus your seat and rein aids) to ask for more complex things like leg yields, canter departs on the correct lead, shoulder in, etc.
If I squeeze both my legs at the girth, I expect more speed. O/W that horse is behind the leg.