Lindsey Ellefson is Lifehacker’s Features Editor. She currently covers study and productivity hacks, as well as household and digital decluttering, and oversees the freelancers on the sex and ...

n this video I explain the mountain climbers exercise for beginners. I know this exercise can be tough if you're new to bodyweight fitness, so I teach it using progression. We start off with a ...

Cardio workouts don’t have to include lots of jumping around. In fact, this kettlebell cardio workout will challenge your aerobic system with a host of low-impact moves—and also work to help you build ...