My two short rides per week were arena work for about 30 minutes each (all I had time for after cleaning the spring mud off Mr. Pigpen). We spent lots of time on stretching, long and low, and lateral work at a walk and slow trot. Sometimes if I had time I would take him for a short walk around the neighborhood afterwards.
Then I made sure I had the time for one long ride on one of the weekend days, when I did not have to feel rushed. We trailered about 20 minutes to a local park that has FANTASTIC trails – a mix of open fields and singletrack through the woods, with long rolling hills that are perfect for conditioning. Oh, and about 10 miles of gravel roads to use if everything was mud, which it often is around here in the spring. I really think it was the quality of the trails that made the big difference for him – the place I had been previously had lots of trails, but you couldn’t do long, uninterrupted trots because they went through people’s backyards. You can’t beat long stretches of trotting for building wind.
On the long rides, we started out with an even mix of walk and trot for about 10 miles, then each ride we increased either speed or distance (never both on the same ride), until by the 5th weekend (5th long ride) we did 15 miles at a working trot (about 8-9 mph for my guy), with short stretches of walk and canter mixed in. That got him plenty fit to finish a flat, sandy 30 in under 4 hours ride time (not including holds). The 50 we did 3 weeks later was at the same park where we train, so it was quite hilly, and he did the first 25 miles in about 3 hours, pulling hard the whole time
Caveat: He has always fitted up easily and maintained fitness well. He had been in competition until the previous November and had about 3 months off, so it’s not like I was starting from square one. YMMV Oh, and he’s an Arabian and was 18 years old at the time, just for context.