All products featured on Self are independently selected by our editors.

However, we may receive compensation from retailers and/or from purchases of products through these links.

It’s no secret that your core musculature is one of the most important muscle groups you’ve got.

Mirinda Carfrae  SELF Spring 2019 Fitness Challenge

Nadya Wasylko

You should really feel the move in your obliques.

Same goes for the side plank crunch (a personal favorite of mine!).

Remember to do a warm-up before you get started on any of these workouts.

Day 5 Workout  SELF Spring 2019 Challenge

Morgan Johnson/Alexandra Genova

Your warm-up should be at least five minutes long and incorporate dynamic movements, not static stretching.

Trythis six-minute one, which doesn’t require any equipment, or do one of your own.

The Workout

Heres a detailed breakdown of the moves youll do.

squat thrust  SELF May 2019 Challenge

Alexandra Genova

Do each exercise for 45 seconds, resting 15 seconds between exercises.

Do the entire circuit 2-5 times, then try the Bonus Move.

Bonus Move

At the end of your last circuit, try the move below for 60 seconds.

side plank crunch  SELF May 2019 Challenge

Alexandra Genova

Mountain Climber

x 60 seconds

Top image: Photographer:Nadya Wasylko.

Stylist:Yuiko Ikebata.

Hair:Jerome Cultera.

popup crunch  SELF May 2019 Challenge

Alexandra Genova

Makeup:Seong Hee.

Prop Stylist:Alex Brannian.

AthleteMirinda Carfraewears Tory Sport bra, similar styles attorysport.com, P.E.

spiderman  SELF May 2019 Challenge

Alexandra Genova

Nation leggings, similar styles atpe-nation.com, Hoka ONE ONE Gaviota Leather shoes, $160,hokaoneone.com.

Workout images and gifs: Photographer:Alexandra Genova.

Stylist:Yuiko Ikebata.

mountain climbers  fast  SELF May 2019 Challenge

Alexandra Genova

Hair:Jerome Cultera.

Makeup:Deanna Melluso.

All products featured on SELF are independently selected by our editors.

If you buy something through our retail links, we may earn an affiliate commission.