Spending extended periods of time under tension, as you do in barre, is a lesser-used way to build strength and endurance. You might perform banded clamshells or squats for 3 minutes straight, completely fatiguing the muscles.
Barre also targets specific areas runners neglect like the hips and core, which are important for stability and energy efficiency, she says. Plus, since it’s low impact, it's an ideal way to cross-train.
The bottom line:
For a longer, healthier running career, Shimansky recommends taking barre (or doing a barre-inspired solo workout) three times per week.