One has to wonder about authors tha talk about animals in the wild sprinting and being injury free.
1 - who says injury free? An injury leads to a slower animal who gets eatin by another??
2 - compared to humans? In that sence, you need to compare the animal not to Trained athletes but to xbox champs who sprint to the letter box for their latest pizza delivery
3 - race horses and greyhounds are the sprinters animal sprinting cousin. The trainers I have encountered for these animals still use massage and Vets and also run into training issues just like humans.