Dec 8, 2025 · To perform the jackknife sit-up, lie on your back with your legs extended, arms overhead. Contract your abs to lift your torso and legs up toward your hands. Keep your legs straight and reach …

Aug 11, 2024 · The jackknife sit-up is an intermediate to advanced ab exercise that only requires your body weight and a little more movement than a basic ab crunch or standard sit-up. It’s a great option …

OK now I am going to demonstrate how to do a jack knife. Its a little bit more of an advanced exercise than a crunch or a side crunch. There's two ways I'm going to demonstrate it: One for a...

How to do a Jackknife Sit Up with proper exercise form. See video form, written instructions and helpful tips.

The jackknife can be done by lying flat on your back with your arms extended overhead and your feet raised slightly above the floor. The jackknife is completed by slowly bringing your straight arms …

The jackknife is a tough move to nail, but it's well worth it. Find out how to build up to this ab-busting, bodyweight move.

Jul 4, 2023 · In this article, we'll dive deep into the Jackknife sit-up, also known as V-Ups, covering its benefits, proper form, and different versions. Whether you're a newbie or a seasoned fitness pro, the …

Lay on the ground flat on your back, your arms above your head on the floor. Then simultaneously lift your legs straight up and your upper body, bringing your hands and your feet together. Then slowly …

Read our jackknife guide. Lwearn how to do this exercise, the muscles worked, and the main benefits.

Jul 18, 2025 · In this article, we will explore what the jackknife exercise is, its benefits, step-by-step instructions on how to perform it correctly, common mistakes to avoid, and variations to suit different …