The 10 Best At-Home HIIT Workouts, From 10 to 45 Minutes

Equipment needed: A treadmill.

If you have a treadmill at home, you're in luck. This 30-minute treadmill HIIT workout is designed to make indoor running more enjoyable. The intervals are structured in a pyramid-style to challenge your speed and endurance. If you tend to get bored on the treadmill, this is a great way to switch up your training and work towards that elusive "runner's high." Just don't forget to warm up beforehand.