Hollow vs Seated Knee Up
Maximizing Your Core Workout Plan
Contents
Planfit users log Seated Knee Up more often — 4,601 sessions vs 531. Compare Core form, muscles worked, and when to use each.
Customize Your Core Workout: Explore the Benefits of Hollow and Seated Knee Up for Better Comparison.
Planfit Users' Choice about Hollow vs Seated Knee Up : Which is Better?
Based on randomly selected data from 1 million completed workouts, Planfit users log Seated Knee Up more often — 4,601 sessions compared to 531 for Hollow.
Popularity is not the whole answer. Hollow and Seated Knee Up differ in the muscles they load, the equipment they need, and how hard they are to learn — the comparison below covers each.
How Hollow and Seated Knee Up Differ
| What differs | Hollow | Seated Knee Up |
|---|---|---|
| Muscles worked | abs and quads | abs |
| Difficulty | 5 of 5 | 2 of 5 |
| Sessions logged by Planfit users | 531 sessions | 4,601 sessions |
How to Hollow
Hollow muscles worked: Core
Form
- 1. Lift your upper body while keeping your feet off the ground.
- 2. Hold while engaging your core.
Coach's Comment
- In the holding position, only your hips should be touching the ground.
If you want to know a detailed guide to Hollow, alternative exercises, and its benefits, check it out here. Check out the Hollow Guide page of our blog!
How to Seated Knee Up
Seated Knee Up muscles worked: Core
Form
- 1. Lift your lower body so that your knees and chest come closer together.
- 2. Allow your upper body to naturally lean forward so that your core can contract.
- 3. Slowly return to the starting position.
Coach's Comment
- If it's too difficult, try proceeding with your knees bent.
If you want to know a detailed guide to Seated Knee Up, alternative exercises, and its benefits, check it out here. Check out the Seated Knee Up Guide page of our blog!
Frequently Asked Questions
Which is better for Core, Hollow or Seated Knee Up?
Planfit users log Seated Knee Up more often — 4,601 sessions against 531 for Hollow. Both train Core, so pick the one that matches the equipment you have and the muscles you want to load.
Do Hollow and Seated Knee Up work the same muscles?
Not quite. Hollow loads abs and quads, and Seated Knee Up loads abs.
What equipment do Hollow and Seated Knee Up need?
Hollow needs bodyweight only, and Seated Knee Up needs bodyweight only.
Which is easier to start with?
Seated Knee Up is the easier place to start. Move to Hollow once your form holds up.
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