

This isn’t totally true (about longer limbs=harder to exercise), because it doesnt take into account how myosin works on a longer muscle/surface area, along with how electrical differences between limbs and the torso help with electrical flow due to potential energy.
Look at a thoroughbred (fastest over medium distance), an Arabian (best for endurance), a quarter horse (fastest in burst over short distance) versus a donkey (stronger pound for pound than a horse but not faster), vs a mule (stronger than horse, faster than donkey). Keep in mind there’s different types of muscle development, eg burst vs long distance. Look at their legs. They are walking on (1) finger, look at where their ankle is. Their feet, like many animals, are angled completely differently than humans. Elephants have a similar foot to humans in that their sole contacts the ground, but obviously their feet don’t extend like ours (and they have bigger muscles). So it is interesting but I think theres more to it
Have you ever had custom shoes made? Or checked what adult little people wear? They may have some suggestions