Stamina refers to your bodys ability to sustain a challenge action over a certain period of time.

Simply put, its what keeps you going.

Here is the rundown for todays workout: four rounds, four minutes each.

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You will feel that a minute is very long in some cases, says Spencer.

Listening to your body is key to pacing yourself throughout these next 22 minutes.

The best approach to building stamina is knowing when to push yourself, and when to back off.

Two young women practicing ballet with a teacher in the dance hall.

instructor atEast River Pilatesin New York City

So roll out a mat, and hit play on the video above to start strong today.

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Woman doing hip exercises

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Cropped image of woman doing lunge yoga pose

Woman in leggings and bra doing Lunge with Arm Extended Up pose hip opener stretch during yoga session in morning at home.

Woman doing arm exercise without weights while sitting on mat at home.

A woman in sports clothes does yoga or gymnastics at home. Daylight. She smiles