Fitness Blender

Fitness Blender has over four million members and has become the top resource for at-home fitness videos. With 500+ full-length (from 10 minutes to over an hour long) practices and 25 years of expertise between the husband and wife trainer partnership, the channel may easily be utilized as the sole resource to develop a complete fitness regimen. They claim "no gimmicks," which is true since you always know what you're getting into—from the titles indicating whether or not equipment is required to the on-screen timer counting down the seconds until an activity is completed.

While the videos are fully free, the trainers do provide planned programs at a moderate cost compared to others in the business. Pick any of the videos with "Brutal" in the title for a challenge.