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Which 10 fitness influencers or athletes are known for their expertise in high-intensity interval training (HIIT)?

1. Kayla Itsines
2. Joe Wicks
3. Shaun T
4. Jillian Michaels
5. Tabata
6. Les Mills
7. Tracy Anderson
8. Kaisa Keranen
9. Autumn Calabrese
10. Ben Greenfield