Every box jump involves a leap of faith. You’ll probably land on top of the box, on your feet, and not make it into one of those box jump fail compilation videos (seriously, do not Google). But how do you convince your brain and body that a solid landing awaits?

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.

Calculators are awesome, but they're not always handy. More to the point, no one wants to be seen reaching for the calculator on their mobile phone when it's time to figure out a 15 per cent gratuity. Here are ten tips to help you crunch numbers in your head.