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You’ve only got a few days left in this Challengeand there’s no stopping you now!

woman doing a kettlebell row

Remi Pyrdol

Today’s workout involves some quick and explosive movementsnamely the star jump and the thruster.

We’ll back up: Your muscles contain a fewtypes of fibersfast-twitch muscle fibers and slow-twitch muscle fibers.

Start withthis warm-upto loosen up your muscles, and end with thisfive-move cool-down.

Day 25 20Minute Core and Cardio

Morgan Johnson

The Workout

Heres a detailed breakdown of the moves youll do.

Do each move below for 45 seconds, resting 15 seconds between moves.

At the end of the circuit, skip to the extended rest or try the Bonus.

Jump Rope Shuffle

Remi Pyrdol

Rest for 60-90 seconds.

Do the entire circuit 3-5 times.

Single-Leg Plank Saw

x 30 seconds on each side

Workout photos: Photographer:James Ryang.

Lateral Plank Walk

Remi Pyrdol

Hair:Siobhan Benson.

Makeup:Sara Glick at Starworks.

Gifs and first photo: Photographer:Remi Pyrdol.

Thruster

Remi Pyrdol

Hair:Clay Nielsen.

Makeup:Hiro Yonemotoat Atelier.

Jackknife

Remi Pyrdol

Star Jump

Remi Pyrdol

Plank Saw

Remi Pyrdol