Happy birthday, Twitter! While 140 characters or less may have seemed inconsequential when the social networking service launched seven years ago, we soon realized the impact just a few words can have on us—and when it comes to exercise motivation, every little bit helps.

To celebrate Twitter's b-day, we've rounded up a few of our favorite inspiring tweets from our favorite tweeps. Be sure you're following all of them, as well as @SHAPE_Magazine to turn your Twitter newsfeed into a one-stop shop for everything you need to live your healthiest, physically and mentally.

1. Best-selling author of The Happiness Project, Gretchen Rubin tweeted, "@GretchenRubin: Secret of Adulthood: Accept yourself, and expect more from yourself." 

2. Fitness and lifestyle coach Liz DiAlto (pictured) offers insight, "@LizDiAlto: 'We tend to steer our lives in the direction of the lessons we need to learn' ~Don Campbell"

3. Nutrition guru and our very own resident Diet Doctor, Mike Roussell, Ph.D.,will get you going on a Monday morning:"@MikeRoussell: Remember this as you start your week. Make Monday your best day ever. #fitfluential #livewithfire http://instagram.com/p/WsvE8zpIg"

4. Celebrity trainer and best-selling author of The Body Reset Diet, Harley Pasternak tweets about health news that will keep you informed, "@HarleyPasternak: WHY YOU NEED TO ACT TODAY IF YOUR OVERWEIGHT...Is obesity irreversible? Timing is key in weight loss: sciencedaily.com/releases/2012/10/121024141635.htm#.UTo8uLpXfrI.twitter…"

RELATED: Sometimes 140 characters isn't enough, but a photo is worth a thousand words. Check out the best healthy celebrity twit pics.

5. Creator of P90X and fitness guru Tony Horton will motivate you to give it your all, "@TonyHorton: Whatever your 100% is... give it!! #Fitness #TonyHorton pic.twitter.com/JyhJYM1N9Q"

6. FItness trainer and inventor of ValSlides, Valerie Waters will pump you up, "@ValerieWaters: Ignore your head and get out of bed and do it anyway. Let's go! #Fitfluential #GoGetIt"

7. Former editorial director at Livestrong.com and fitness editor at Men's Health, we love Adam Bornstein's encouraging tweets, "@BornFitness: No Time. No motivation. No hope. No belief. No money. No reason for any of those to stop you. #BeRelentless #Believe"

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