If you want authentic materials for your lesson but don’t have time to search the net, here’s something for you. Topical, engaging news articles and video clips with suggested teaching ideas.
There are lots of interesting, authentic resources for the healthy living topic on the Spanish site www.familiaysalud.es (thanks to @icpjones on Twitter for mentioning this source).
You could use the audio recording on the 10 commandments of healthy eating page and ask sudents to jot down the key ideas for each of the 10 recommendations.
Then download the pdf of the poster which accompanies this for students to check their answers, find key vocabulary or translate the advice.
Plenty of inspiration for students to come up with a similar list for healthy living or exercise or to lead to a speaking task about which of these bits of advice they already/should put into practice.