I’ve found that my form has improved when returning to regular bodyweight sit-ups, as I’m thinking more about moving from my core than using the momentum of my arms to swing my torso up.

Enter: the V-up. Also known as a jackknife, the bodyweight move recruits the entire core and provides a stability challenge that sit-ups and crunches ... That's 1 rep. Form cue: I can't say ...

This is a low-impact workout, suitable for most people, but if you’re pregnant, or returning to fitness following an injury, ...