beasts

1. Any animal other than a human; usually only applied to land vertebrates, especially large or dangerous four-footed ones.
2. (more specific) A domestic animal, especially a bovine farm animal.
3. A person who behaves in a violent, antisocial or uncivilized manner.
4. Anything regarded as larger or more powerful than one of its normal size or strength.

   That is a beast of a stadium.

5. Someone who is particularly impressive, especially athletically or physically.
6. (prisons) A sex offender.
7. Something unpleasant and difficult.
8. A thing or matter, especially a difficult or unruly one.

verb

To impose arduous exercises, either as training or as punishment.