Taylor Swift wears Forme for posture support. I tested the activewear brand’s full set on a run — here’s how it performed.

Functional training is one of the best ways to build a strong body, grow muscle and increase power and resilience to injury.

For fitness enthusiasts who need a little cardio variety, HIIT (or high-intensity interval training) has long been a popular choice. According to a study in Biology of Sport, HIIT — which pairs short ...