How do you say life is full of challenges in french language?

Here are a few ways to say "life is full of challenges" in French:

Formal:

* La vie est pleine de défis. (This is the most literal translation)

* La vie regorge de difficultés. (This emphasizes the difficulties)

Informal:

* La vie n'est pas un long fleuve tranquille. (This means "Life isn't a smooth river," implying that there are obstacles)

* La vie, c'est pas toujours facile. (This translates to "Life isn't always easy")

* Y'a pas que des roses dans la vie. (This literally means "There aren't only roses in life," implying there are thorns too)

The best way to say it will depend on the context and the tone you want to convey.