Furthermore, we are informed, the fields are flat, so the animals don't have to build tough muscle to get to lunch or dinner. (fieryfoodscentral.com)
The gastrocnemius and soleus muscles are some pretty tough muscle groups — they are engaged in a repetitive manner every time you move, run, climb and jump, so they're used to dealing with a lot of load on a daily basis. (fitnessandpower.com)
It weighed as much as 6 metric tons, was up to 11 meters long, and sported a long, narrow skull and bony spines poking up from its vertebrae that probably supported a ridge made of tough muscle. (sciencemag.org)