What is it? “The hardest workout ever put on DVD.” You may have seen endless TV infomercials for this last time you got drunk and binged on cold pizza at 4am.

How much does it cost? “Just three easy payments of £33 (plus p&p).”

What does it promise? To make you “one of the fittest people on the planet” in 60 days.

What’s it actually like? To try Insanity is deliberately to block out all the overcompensatory macho guff it comes wrapped in. And there’s a lot. Insanity is marketed at douchebags who chest-bump and crumple cans on their foreheads and feel the need to bellow the phrase “CRUSHED IT!!!” under every Instagram of every workout. Which is sad, because the DVDs themselves are actually pretty good. They’re full of deliberately intense interval-style plyometric, core and cardio exercises with hyped-up names – such as the Power Jack and the Suicide Jump – that you can perform in your own living room, and they do genuinely test your endurance.

It’s by no means for beginners, but there are still plenty of other – and maybe better – home workouts available. Plus, if you really want to get in shape, it’s always better to find a good interval class at a gym where you can’t just stop and sit on the sofa for a bit.

Best and worst bit? Insanity is a very demanding high-intensity workout. However, its whole ethos prizes effort over technique, which means you might do it wrong and risk injury. Many of the workouts are soundtracked by a guy shouting the word “push” while other people grunt, which gives the impression that everyone involved is terribly constipated.

Is it worth it? If you must.