Cows and Keeping Fit

A warm and rather muggy evening when the Keep Fit session seemed rather more gruelling and sweaty than normal - will it ever get easier? 
And then in the next field there are these peaceful cows, perfectly fulfilled, enjoying being with their calves and taking life as it comes, with never a thought about how toned they are or otherwise. Of course, a diet consisting mainly of greens goes a long way to excluding the possibility of becoming overweight - they are all perfectly shaped females. They probably have no ambition to climb mountains or swim Lakes or beat their own Park Run record. It's also likely they are content living in their own skins and don't wish to be something they are not, like a sheep or a pheasant or younger. 
There are many disadvantages to actually being a cow, not least having a foreshortened life and a massive udder, but sometimes I think it would be more restful to just chew cud, accept that things are what they are and be content.