Don’t know where to start with strength training? This expert-approved formula is the simplest way to build muscle at home

Smiling woman flexes her biceps.

There are endless workout routines online to pick from, so you’ll never be wanting for ideas, but you can save yourself a lot of time by having a tried-and-tested formula to fall back on.

There are plenty of those floating around as well, but not so many that let you shape the workouts to your preferences.