Look, I’m gonna be straight with you – those online calculators that tell you exactly how many jumping jacks you need to burn 500 calories? They’re basically making educated guesses about your body.

Swinging these cannonball-like weights can supercharge your body’s fat-burning potential - Getty Want to burn a lot of calories, fast? Kettlebells may be the answer. Swinging these cannonball-like ...

Much like how long it takes to walk 10,000 steps and how far you’ll walk over 10,000 steps, how many calories you’ll burn from walking 10,000 steps depends on a few factors. There’s no X steps = Y ...

Add Yahoo as a preferred source to see more of our stories on Google. Person doing jumping jacks workout Look, I’m gonna be straight with you – those online calculators that tell you exactly how many ...