I've started lessons again at a fantastic barn and have been riding a gorgeous Irish Sport Horse. He definitely knows what he's doing and has done it all, but he's also quite lazy and I feel like I'm having to work way too hard at everything. I know part of it is my lack of riding muscles which he can probably sense, and those will come with time. But it doesn't feel very elegant or effective to always be getting after him to move on.
For now, what should I be doing to create more impulsion? Specifically, I seem to get him to a good pace and lose any impulsion around turns (or circles, serpentines, etc). The indoor arena is small (too muddy outside lately) so I feel like I barely get any good strides on the long side before he's just dying on the corners. I'm using a crop and small spurs (which my instructor is confident I can use, so my legs and position must not be that far off after 4 years), but I think there is more I could be doing with my seat to really get him moving. Any specific suggestions? His lack of impulsion really affects our jumping as well because he has a habit of stopping (occasionally) or inserting strides (much more often; which on a horse his size is pretty awkward ) if he lacks the impulsion going into the line.
Thank you for your help!