I swapped sit-ups for this abs exercise, and it's made a huge difference

The three-legged plank to tiger curl strengthens your core, hips and shoulders.

Stop doing 100s of sit-ups! Build strong, stable abs with McGill curl-ups

The modified McGill curl-up is a Pilates go-to for ultimate core control and strength.
Tom's Guide

I'm not exaggerating — this is one of my favorite abs exercises you can do sitting down to build a stronger core

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No, not planks or sit-ups — here's the one abs exercise you need for elite core strength and stability without weights

Hollow knee tucks are a bodyweight exercise that strengthens your core and hips without hurting your spine. Here's how to do them.
Golf Digest

Four great ab exercises golfers should do instead of crunches

The problem with classic ab exercises like sit-ups and crunches is that they put your the top portion of your spine (the cervical vertabrae) in flexion. In a world where you spend a good portion of ...