--- title: Tighten Your Core With Celebrity Trainer Anna Kaiser, AKT description: Watch celebrity trainer Anna Kaiser show you how to strengthen your core in order to get sleek abs and avoid injuries during work outs. canonical: https://time.com/5172932/anna-kaiser-core-abs-strength-workout-video/ author: Anna Kaiser article:opinion: false article:content_tier: free article:published_time: 2018-02-27T13:00:56.000Z article:modified_time: 2026-04-13T09:05:59.737Z og:title: 7 Moves to Tighten Your Core From Celebrity Trainer Anna Kaiser og:description: All you'll need is a slightly deflated overball og:url: https://time.com/5172932/anna-kaiser-core-abs-strength-workout-video/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltd1ab491c911193a5/698928bc096a9417db6a19eb/screen-shot-2018-02-23-at-11-58-15-am.png?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 2738 og:image:height: 1540 og:image:alt: Anna Kaiser, AKT in Motion og:type: article twitter:card: summary_large_image twitter:title: 7 Moves to Tighten Your Core From Celebrity Trainer Anna Kaiser twitter:description: All you'll need is a slightly deflated overball twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/bltd1ab491c911193a5/698928bc096a9417db6a19eb/screen-shot-2018-02-23-at-11-58-15-am.png?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # 7 Moves to Tighten Your Core From Celebrity Trainer Anna Kaiser > Sponsored content. 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Worth Your Time is TIME's culture newsletter, published Tuesdays and Saturdays to 40,000 subscribers as of August 2026. #### Who writes TIME's culture recommendations? Culture editor Eliza Berman writes Worth Your Time, drawing on TIME's critics and culture desk. #### Is Worth Your Time free? Yes. It is a free newsletter available at time.com/newsletters. by [Anna Kaiser](https://time.com/author/anna-kaiser/) ## Anna Kaiser Feb 27, 2018 1:00 PM UTC  by [Anna Kaiser](https://time.com/author/anna-kaiser/) ## Anna Kaiser Feb 27, 2018 1:00 PM UTC Strong abs won’t just make you feel more comfortable in a bathing suit or bikini; your core is the source of power for your entire body. It includes not only the front of your torso, but also your [hips](https://www.livestrong.com/article/98988-core-muscles-body/), pelvic floor, back and the muscles that [wrap around the side](https://www.acefitness.org/fitness-certifications/resource-center/exam-preparation-blog/3562/muscles-of-the-core) of your body. Everything else — arms, legs, head — are an extension of your core, so it’s important to strengthen this area of your body for a variety of functions, including stability. Your core is also the the basis of proper movement in exercise, and a powerful one will also help you [avoid injuries during training](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3806175/). When you work with a slightly deflated [overball](https://www.amazon.com/gp/product/B002C9GORA/ref=as%5Fli%5Fqf%5Fasin%5Fil%5Ftl?ie=UTF8&tag=time037-20&creative=9325&linkCode=as2&creativeASIN=B002C9GORA&linkId=0cc207e652d200f228fef95857446996), your body has to work a little harder to stabilize your core. At the same time, the overball acts as a guide and gives you some support as you move through the various moves. It can also help remind you to pull your navel to your spine when working on your abs. Just be aware of not sinking your weight into the ball — it’s not there for you to relax! From flutter kicks to oblique twists and C-curve crunches, these seven moves will help you strengthen your core, and of course, help create sleek abs. Remember to breathe through the exercises: You exhale on exertion and pull your navel closer to the spine for all of these moves. It’s also important to maintain proper form and to take a break — instead of compromising your positioning — if you’re feeling tired. **TIP:** For the flutter kicks, adjust the angle of your legs depending on your level of strength. Your back should never arch off the ground. _Perform this routine, which should take approximately 10 minutes, at least 3x per week._ ```json [{"@context":"https://schema.org","@type":"NewsArticle","@id":"https://time.com/5172932/anna-kaiser-core-abs-strength-workout-video/","mainEntityOfPage":{"@type":"WebPage","@id":"https://time.com/5172932/anna-kaiser-core-abs-strength-workout-video/"},"headline":"7 Moves to Tighten Your Core From Celebrity Trainer Anna Kaiser","datePublished":"2018-02-27T13:00:56.000Z","dateModified":"2026-04-13T09:05:59.737Z","description":"All you'll need is a slightly deflated overball","url":"https://time.com/5172932/anna-kaiser-core-abs-strength-workout-video/","keywords":["motto","fitness","health","Working out","healthytime"],"thumbnailUrl":"https://static.time.com/v3/assets/bltea6093859af6183b/bltd1ab491c911193a5/698928bc096a9417db6a19eb/screen-shot-2018-02-23-at-11-58-15-am.png?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","author":[{"@type":"Person","name":"Anna Kaiser","jobTitle":null,"url":"https://time.com/author/anna-kaiser/"}],"articleSection":"","image":[{"@type":"ImageObject","url":"https://static.time.com/v3/assets/bltea6093859af6183b/bltd1ab491c911193a5/698928bc096a9417db6a19eb/screen-shot-2018-02-23-at-11-58-15-am.png?branch=production&width=1200&quality=75&auto=webp&crop=1200:675&height=675","width":1200,"height":675,"headline":"Anna Kaiser, AKT in Motion","caption":"","creditText":"","representativeOfPage":true}],"publisher":{"@type":"Organization","name":"Time","url":"https://time.com/","logo":{"@type":"ImageObject","url":"https://time.com/images/logo.png","width":528,"height":156},"foundingDate":"March 3, 1923","sameAs":["https://www.facebook.com/time","https://www.instagram.com/time/?hl=en","https://twitter.com/time","https://www.pinterest.com/timemagazine"]}},{"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"/tag/motto/","name":"motto"}},{"@type":"ListItem","position":2,"item":{"@id":"https://time.com/5172932/anna-kaiser-core-abs-strength-workout-video/","name":"7 Moves to Tighten Your Core From Celebrity Trainer Anna Kaiser"}}]}] ```