. >> 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,