Usages of strenuus
Duo iumenta ante raedam stant: una mula lenta est, alterum iumentum strenuum est.
Two draft animals stand before the carriage: one mule is slow, the other animal is energetic.
Pater, quamquam fessus est, non ignavus sed strenuus manet et mulam in stabulo curat.
Father, although he is tired, remains not lazy but energetic, and takes care of the she-mule in the stable.
Elon.io is an online learning platform
We have an entire course teaching Latin grammar and vocabulary.