Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Almost every gym I’ve ...

Q: I got into a discussion the other day about the lenght of intervals. This program has as you know one interval of 30 seconds and one of 1 minute (I am just finishing week 2 and those have been the ...

Good Thursday morning from New Zealand. It's 8:30am where I am, and 2:30pm EST where most of you are...here's today's info and motivation... Last year I was interviewed by National Geographic magazine ...