Hay Belly

So I noticed Beau's starting to get a bit of a hay belly.
What can I do to reverse this? I haven't been riding as much lately, but now that the weather's cooling down some I'm going to be riding almost daily again.

Anyone?

If you are going to be riding more often again that should solve the problem. Otherwise you might want to check out the quality of your hay. If it is very mature and/or poor quality it could be contributing to the problem.

More work or less pasture. Our mare Lady will get fat just looking at a nice, green pasture if she's not worked.

When was he dewormed last? They can get that look to them if they're wormy also.

Would that also make their topline deteriorate?
That's a good point actually. My trainer always tells me when to worm him, so I'm not sure to be honest. I'm never sure if she is going to do it herself or make me buy it, it varies.