. >> announcer: that's because rockin' body was created by fitness expert and insanity creator shaun t. but what you may not know is that he's a world-renowned dancer and choreographer, and for years, people have waited in sold-out lines to take his dance classes to learn shaun's fun, easy-to-follow moves designed to transform their bodies, all while they're just dancing to great music. >> i've created many workout programs, and some of them are insanely hard, but if you want something easy and fun and gives you the same amazing results then rockin' body is perfect for you. so, come dance with me, and i'll help you lose weight the easy way. >> if you can walk, you can rock. >> you're having fun while you're getting the best workout for your body that you possibly could. >> i danced my head off, and i had a great time, and now, 24 pounds later, 30 inches overall, i'm a new person. >> announcer: rockin' body is so effective because you're not just dancing and having fun with every low-impact move. you're actually burning fat more efficiently than other workout programs. exercises like wa

. >> announcer: shaun t. created t25 with one goal in mind -- take an hour-long workout and compress it into 25 minutes. >> with t25, every second counts. it's intense, but you're gonna get an hour's results in just 25 minutes. >> announcer: how does he do it? a proven technique called focus interval training. you focus on one muscle at a time and then move on to the next without any rest. you literally work every muscle in your body in 25 minutes. there's not a moment wasted. >> that's why it's a perfect workout. you get in, you get it done, you sweat like crazy. you get amazing results. >> announcer: if you haven't worked out in years, it doesn't matter. t25 has a low-impact modifier for every move. and even if you modify, you'll still get the same results. >> i am proof that, with t25 even modify, you can get the results you want. >> announcer: shaun wants you to nail your workouts. >> nail this workout! nail it! come on! >> announcer: so he's including everything you need -- the workouts, nutrition plan,

plus get fitness tips for the new year from the insanity fitness guru, shaun t. now here's wendy!

t25 was created by a guy who knows a thing or two about insane results -- supertrainer shaun t. >> i

plus get fitness tips for the new year from the insanity fitness guru, shaun t. now here's wendy!

plus, shaun t brings in sanding to the studio as we continue our "kick-start the new year: fitness editionuse] ♪ kelly: thank you. hi.