For one whole year, Gretchen Rubin dedicated herself to finding ways to bring more happiness to her daily life. In "The Happiness Project," (which has the delightful secondary title "Or Why I Spent a Year Trying to Sing in the Morning, Clean my Closets, Fight Right, Read Aristotle, and Generally Have More Fun") Rubin records how she chose a new focus each month, and improved upon that area in her life in order to boost her own personal happiness.

Some of her monthly intentions include focusing on boosting energy, aiming higher, remembering love, and contemplating the heavens. She offers insights and shares her story of how she broke down each of these goals and found concrete, doable actions to help her achieve each one.

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In his book "The Four Agreements," Don Miguel Ruiz uses ancient Toltec wisdom to create a "code of conduct" as he calls it, to live a life powered by happiness and love.

The book gives examples and explanations for the four agreements everyone should make with themselves. Ruiz lists these agreements as:

1. Be impeccable with your word
2. Don't take anything personally
3. Don't make assumptions
4. Always do your best

They are seemingly easy rules to follow, but can sometimes prove to be a challenge when put into practice. Ruiz assures that following these four steps will lead to personal freedom.

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Jen Sincero's #1 New York Times Bestselling book "You Are a Badass: How to Start Doubting Your Greatness and Start Living as Awesome Life" is a refreshingly funny and personable self-help book. Sincero shares how she went from zero to hero, and literally transformed her life by embracing gratitude and taking accountability for her thoughts, because, as she shares, "our thoughts become our words, our words become our beliefs, our beliefs become our actions, our actions become our habits, and our habits become our realities."

A big takeaway from this book is the idea of tuning into — and embracing — the frequencies of the universe. When you tap into that energy source, amazing things can happen.

In 2018, Sincero published "You Are a Badass Every Day: How to Keep Your Motivation Strong, Your Vibe High, and Your Quest for Transformation Unstoppable." This companion book is filled with exercises designed to keep you on the road of badassery. It can serve as a piece of equipment in your "spiritual gym," and Sincero hopes that the book aids you in your journey by "giving you quick perspective shifts, reminders, meditations, and loving motivational spankings."

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In her first book, "Adding More Ing to Your Life: a Hip Guide to Happiness," Gabrielle Bernstein shares her 30-day system for accessing your "ing," or your inner guide. She takes you step by step through her "Ing Equation," which is a combination of exposing your negative thoughts to yourself and replacing them with positive affirmations (rethinking), physical activity (moving), and mindful meditation (receiving). Repeat this equation everyday for 30 days to see some real change.

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McMillan is here to reroute the way you think about love and relationships. What started off as a wildly successful Huffington Post article of the same name, "Why You're Not Married...Yet," is chock-full of quality relationship advice.

For those who struggle to find, and stay in, long-lasting relationships, McMillan breaks down the various ways women sabotage their relationships, and offers solutions. However, despite the tough-love titles of her chapters — including "You're a Bitch," "You're Shallow," and "You're a Slut" (ouch) — McMillan is a sympathetic friend who shares her own journey with finding love so that you can learn from her successes and mistakes.

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