Killer workouts come with bragging rights: can you believe you survived that? But you can get a perfectly good sweat on without doing anything labelled "high intensity" or headed by a sadistic coach. It's okay for a workout not to feel like torture, but only like work.

Crossfit's intense workouts are a polarising subject of discussion. It seems the first rule of Crossfit club is that you must never shut up about Crossfit club, and on the flip side, the sport (routine? Discipline? Hobby?) has its share of haters. So let's take a minute to cut through that for anyone who's intrigued but isn't sure what they would be getting into and whether it's worthwhile.

Video: Ever wonder how MMA fighters and football players get those quick feet? A big part of the secret is footwork drills like these. Practise them in short bursts, and you've got a great cardio workout.

How's the Lifehacker Fitness Challenge treating you? If you're logging a ton of kilometres, great -- but if you've slacked off a bit or are just joining us, that's fine too. This week's workout is for everyone. We're going to run some tiny solo races, and they will make you faster.

The last time we talked about rowing machines, we said rowing was a full-body, low-impact cardio workout and an excellent substitution for running on the treadmill. Now here are a couple of intense rowing interval workouts you can try, but be warned: You're going to hate them. In a good way.

If the Olympics inspired you to take another look at your neighbourhood pool, probably the biggest thing holding you back is the question: What do I actually do when I'm in there? Here's how to turn a day at the pool into a satisfying workout.

If you want to be the very best, like no one ever was, you need to get in shape. Pokémon GO is already getting people to move more, but you may want to crank things up a notch. This workout will get you fit while you play, and can be easily tailored to your area.

Doing sprint intervals on a running track or the treadmill at the gym is a popular way to get an effective, short cardio workout. There's one major gripe: You're mainly working out your legs. With "hurricane sprints", your upper body and core can actively join the fun.