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Don't ignore these other factors as well. that's important to mention. and the study just looks at the association between recommended exercise and your cancer risk. it would be great to see more research that really looks at there's a direct relationship there, but overall, it's really promising. and if you follow these recommendations, it comes with great benefits. >> what i like about it is 2 1/2 hours a week of moderate exercise like walking, i can do that. >> walking counts as moderate exercise? >> moderate intensity aerobic exercise can include swimming. if you do enjoy walking. make sur...

So feet together and apart. left right left. so you're not crossing your feet, tucker, you're taking your right foot out and bringing the left to it. a little hop and that really starts to burn your left outer thigh a and then you can walk forward again. >> there's also the danger question. >> what about these sprint intervals, i do this all the time on the treadmill, and i don't know if i'm doing it at the right time. >> sprint intervals are great. if you bring the incline down to about 3, to mimic outside i would go 3.5, nice and fast. you can do that for about 30 seconds to a minute, nice a...