In HIIT-style workouts, youll be interspersing periods of superhard effort with lighter periods of recovery.

A heart-pumping, sweat-inducing cardio workout.

Youll just be upping the intensity a bit now that youre well into the challenge!

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Katie Thompson

Thesecardio exercisesinclude the inchworm, lateral shuffle, high knees, skater, and up-down plank.

And the high knees exercise can help you build lower-body power, especially in your quads and glutes.

A few solid reps will help you reap better results than rushing through your time period with improper form.

Inchworm exercise move

Get ready to crush this high-intensity cardio workoutand then look forward to your rest day tomorrow!

The workout below is for Day 9 of the SELF Spring Reset Challenge.

Check out the full month of workouts righthere.

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Or go to the workout calendarhere.

If you havent signed up to receive daily emails, do thathere.

Do each move for your selected period of time.

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At the end of all 5 moves, rest for 90 seconds.

That’s 1 circuit.

Do the entire circuit 35 times.

Skater exercise move

After your last circuit, try the optional extra credit.

Hold a forearm plank for 2 minutes.

UpDown Plank

Forearm plank