Today’s featured Core Envy sculpting exercise: Side Plank. Side Planks are a must-have exercise when it comes to strengthening the core because they recruit so many muscle fibers. This one is tough but well worth it!

Allison Westfahl’s Core Envy will tone and sculpt your abs, back, stomach, and sides—and build a strong, sexy core you’ll love showing off. Her Core Envy program solves the problems other abs programs ignore with a three-part approach to slim down and tone up. You’ll clean up your diet, fire up your metabolism, and tighten up all the muscles of your core without a gym or equipment. In just three weeks, you’ll start seeing results.

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