Deafult HIIT database

[DonaldTsang]

Would it be useful to have a default set of HIIT regimes under the app? Here are some examples:

• https://www.womenshealthmag.com/fitness/g29714043/hiit-workouts-for-women/
• https://www.mensjournal.com/health-fitness/10-hiit-workouts-get-you-shredded-summer/
• https://blog.paleohacks.com/10-effective-hiit-workouts/
• https://www.menshealth.com/fitness/a25424850/best-hiit-exercises-workout/
• https://www.fitnessmagazine.com/workout/lose-weight/burn-fat/killer-hiit-exercises/
• https://www.womenshealthmag.com/uk/fitness/workouts/a707801/hiit-workout-at-home/
• https://yurielkaim.com/hiit-workout-examples/
• https://darebee.com/100-hiit-workouts.html