Since Hunny is just getting back into shape, and we can't go far because of baby, we keep it at a brisk walk for only about a quarter mile, breaking frequently for baby to take a break, then we fox trot home again breaking frequently. A great book for conditioning any type of horse is a book by Jec Aristotle Balliou and here is a link to it...
It is very informative and has different exercise programs for all different types of horses. It also has cardio exercises, stretches, a couple of massage moves, and tear out cards so you can keep those with you instead of taking the book everywhere! (which I do anyways because it's AWESOME!)
This book is always with me when riding. I can do things quickly that work well for Hunny in her current condition, and it really gives results