It’s true: adding variety to your workout routine improves your overall fitness. Switching up your training prevents injuries, and provides your body with "muscle confusion," which keeps you from hitting a plateau by forcing your muscles to constantly adapt.
Athlete stress : Good Stress vs. Bad Stress
The Sweet Spot Exercise: Get Ideas for the Next Great Move in Your Career — Lisa Hoashi
How to Improve Your FTP with Sweet Spot Training?
Test your fitness at any age with these simple exercises - Washington Post
How to Improve Your FTP with Sweet Spot Training?
Sweetspot training: the most bang for your training buck? - BikeRadar
16 Hip Stretches Your Body Really Needs
YOGA AND YOUR SKIN: THE PERFECT UNION
The Sweet Spot. How to Know When You've Outgrown Your…, by dougweitz, Learning At Work
PDF) Hitting Your Sweet Spot: The Fine Balance of Being Flexible
How Much Sweet Spot Training Should You Do? – FasCat Coaching