• Events

    Running

    RunningCouch to 5K5K10KHalf MarathonMarathonSee All

    Outdoor

    OutdoorCampingHikingSee All

    Triathlon

    TriathlonSprintOlympic/InternationalIRONMAN 70.3IRONMANSee All

    Cycling

    CyclingRoad CyclingCentury RidesMountain BikingSee All

    Sports

    BaseballBasketballFootballGolfMartial ArtsSoccerSoftballSwimmingTennisVolleyballWinter SportsYoga

    hidden

    active kidsactive kidsSports CampsBrowse All EventsRace Results
  • Calculators

    Calculators

    Running PaceBody Fat PercentageBody Mass Index (BMI)Ideal WeightHeart Rate
    Caloric NeedsNutritional NeedsBasal Metabolic Rate (BMR)Kids' Body Mass Index (BMI)
  • Running

    Running Events

    RunningCouch to 5K5K10KHalf MarathonMarathonSee All

    Running Articles

    RunningDistance RunningTrail RunningMud RunningTraining PlansProduct Reviews
  • Triathlon

    Triathlon Events

    TriathlonSuper SprintSprintOlympic/InternationalIRONMAN 70.3IRONMANSee All

    Cycling Events

    CyclingRoad CyclingCentury RidesMountain BikingSee All

    Triathlon Articles

    TriathlonDuathlonTraining PlansProduct Reviews

    Cycling Articles

    CyclingMountain BikingCyclo-CrossBMXTraining PlansProduct Reviews
  • Fitness

    Fitness Events

    FitnessWalkingYogaStrength TrainingPilatesWeight LiftingSee All

    Fitness Articles

    FitnessWorkoutsWalkingYogaWeight LossTraining PlansProduct Reviews
  • Sports

    Sports Events

    BaseballBasketballFootballGolfMartial ArtsSoccerSoftballSwimmingTennisVolleyballWinter Sports

    Outdoor Events

    OutdoorCampingHikingBook CampgroundSee All

    Sports Articles

    SportsSwimmingBasketballTennisBaseballSoccerSoftballVolleyballFootballLacrosseGolf

    hidden

    Water SportsIce HockeyGymnasticsMartial ArtsSkiCampingHikingTravelSailingDanceSnowshoeing
  • Nutrition

    Nutrition Articles

    NutritionMeal PrepRecipesSnacksSupplementsProduct Reviews

    Health & Injury Articles

    Health & InjuryPhysical HealthMental HealthPainInjury PreventionRecoverySleepProduct Reviews
  • Kids & Family

    Kids

    Infants (0-1)Toddlers (2-4)Big Kids (5-8)Tweens (9-12)Teens (13-18)

    Events

    SwimmingBasketballBaseballSoccerTennisVolleyballFootballMartial ArtsChildcare

    hidden

    YogaCheerleadingGymnasticsDanceMusicArts & CraftsKids FitnessSee All

    hidden

    active kidsactive kids
  1. Home
  2. >
  3. Fitness Articles
  4. >
  5. Core Ab Training
Core Training

Featured

Celebrate The 40th Annual Army Ten-Miler At The Pentagon

Come join the 3rd largest 10-mile road race in the world!

How to Balance Triathlon Training with a Busy Schedule

Balance triathlon training with a busy schedule! Learn time-management tips to fit workouts into your busy lifestyle. Find time to train and perfor...

By Taren Gesell

10 Step Transition Plan: From Treadmill To Outdoor Running

After a winter of treadmill miles, the return of outdoor running can feel both exciting and surprisingly challenging. Learn how to ease into outdoo...

By Lori Russell

Suunto Spark Open-Ear Headphones

Looking for headphones that keep you aware of your surroundings without sacrificing sound quality? The Suunto Spark open-ear headphones combine inn...

By Stephen Gendreau

Latest

Garmin Introduces The Index Sleep Monitor Band For Comprehensive Sleep Tracking

Discover Garmin’s Index Sleep Monitor, offering detailed sleep insights to optimize recovery.

By Stephen Gendreau

Summer Running Shirts That Keep You Cool And Comfortable

The best summer running shirts are lightweight, moisture-wicking, and breathable, ensuring you can keep up your routine in comfort, regardless of t...

By Stephen Gendreau

Review of the Hyperice Hyperboot by Nike and Hyperice

Discover how the Hyperboot by Nike and Hyperice can elevate runner recovery with innovative heat and compression technology.

By Stephen Gendreau

I Tried AG1 Next Gen For 30 Days - Here’s What I REALLY Think

AG1’s new Next Gen formula is packed with vitamins, prebiotics, probiotics, and a bunch of superfood extracts.

By Megan Harrington

How to Choose Your Running Fuel - Gels vs. Chews vs. Real Food

Part of the process is trial and error, but being informed is a good first step. Use this guide to jumpstart your efforts to choose the right runni...

By Megan Harrington

Craft Kype Pro Running Shoe Review

Explore the Craft Kype Pro running shoe. Unlock elite performance with carbon plating, Xx Foam midsoles, and responsive design for long-distance sp...

By Stephen Gendreau

Reebok Introduces The FloatZig 2 Running Shoes

Springy. Bouncy.

HOKA Launches Mafate X

Redefining the original HOKA trail shoe - Now evolved for modern Ultra Racing. Maximal Cushion Meets Innovation in the HOKA Brand’s Latest Trail Shoe.

  • ACTIVE Logo
  • ACTIVE is the leader in online event registrations from 5k running races and marathons to softball leagues and local events. ACTIVE also makes it easy to learn and prepare for all the things you love to do with expert resources, training plans and fitness calculators.

Follow ACTIVE
  • Facebook
  • Twitter
  • Pinterest
  • Instagram
Mobile Apps
  • ACTIVE.com App
  • Couch to 5K®
  • 5K to 10K
  • Meet Mobile
  • View All Mobile Apps
Things To Do
  • Running Races
  • Triathlon Races
  • Cycling
  • Mountain Biking
  • 5K Races
  • 10K Races
  • More Things to Do
  • Half Marathon
  • Marathon
  • Ultra Running
  • Trail Running
  • Mud Runs
  • Swimming
Popular on ACTIVE.com
  • San Diego
  • Los Angeles
  • New York City
  • Denver
  • Houston
  • Las Vegas
  • BMI Calculator
  • Calorie Calculator
  • 5K Training
  • Couch to 5K®
  • Half Marathon Training
  • Marathon Training
  • Organizer Technology Solutions
  • Earn Money
  • Account Access
  • Subscribe to Our Newsletter
  • Do Not Sell My Personal Information
  • About ACTIVE.com
  • Sitemap
  • Terms of Use
  • Copyright Policy
  • Privacy Notice
  • Privacy Settings
  • Careers
  • Support & Feedback
  • ACTIVE Access
  • Advertise With Us
  • Registration Software
  • Social Media Guidelines
  • Community Policies
  • Cookies Settings
  • ©2025Active Network, LLC and/or its affiliates and licensors. All rights reserved.