Get In The Best Shape of Your Life With REDBOOK's 21-Day Strong Sexy You Challenge

 We don't mean to brag, but this year, we've developed a super simple plan with serious results in mind. 

Here's how to join the challenge:

1) Video: Every time you start your workout, watch all the days leading up to the day you're on, following along with the exercises. For example, on Day 1, you'd do the plank. Day 2, it's the plank + 6 supermans. Day 3, you add on 3 kneeling sit-ups. By Day 21, you'll be doing all 21 exercises. Phew!

2) Chart. Pin this chart, or bookmark this page, and follow along below. You'll find descriptions of all the exercises in the video.

How One Woman Lost Nearly 100 Lbs by Making Weight Loss Fun

Before: 232 lbs
After: 137 lbs
Kacey Lauchnor, 25, grew up in a family with suspect health habits. "If we ever ate a vegetable, it was covered in cheese," says the graphic designer from Herriman, Utah. Her eating habits continued throughout college and after her wedding, and by 2012, 5'6" Kacey clocked in at 232 pounds. "I knew I was getting fat," she says. "But I still thought, I'm not that fat."

Here's how Kacey was able to accomplish her weight-loss goals:

•  Write down the plan. "Willpower doesn't happen in the moment. Always make food decisions—like what you'll eat for lunch—ahead of time so you're not tempted in the moment."
•  Learn what full is. "As I started to focus on eating more slowly, I began to naturally notice when I felt like stopping."
•  Find exercise you enjoy. "If your workout feels like suffering, try something else."