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The #1 Core Workout to Strengthen & Sculpt Your Abs in 6 Weeks

Get the defined abs you've always wanted with this trainer-approved routine.
FACT CHECKED BY Alek Korab

We've all been there – struggling with stubborn belly fat that just won't budge despite our best efforts. As a personal trainer for over two decades, I've dedicated my career to helping people achieve their fitness goals, including tackling that persistent abdominal fat. Through years of experience analyzing client needs and developing personalized workout plans, I've discovered that success comes from both the right exercises and the right mindset. Follow this proven core workout routine to finally see the abs you've been working for.

How Targeted Core Workouts Sculpt Your Abs

While there are various methods to strengthen and sculpt abs, targeted core workouts specifically engage the muscles in the ab region. These types of exercises allow for specific targeting of individual muscles within one's abs, such as external and internal obliques, rectus abdominus, pyramidalis, and transversus abdominis. They put focused training and development on those muscles to provide stronger and more defined abs. Targeted core workouts also improve the work efficiency of your core muscles together, leading to enhanced ability to stabilize your spine and pelvis.

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Top 5 Core Exercises for Faster Ab Definition

Planks

illustration of forearm plank
Shutterstock

Step-by-step form instructions:

Position yourself on your stomach. Place your forearms flat with your elbows directly under your shoulders. With your legs straight out, raise yourself on your toes. Keep your body in a straight line.

How many sets and reps to do: 

In order to reach ab definition faster, you should perform two to three sets of 30 to 60-second holds.

What makes this move so effective:

Planks provide a more functional and visible definition by engaging the entire core muscle group simultaneously. This move also helps to stabilize and strengthen the core without straining the spine.

Options to make it easier or harder:

If you are a beginner, a great modification to make this easier is to perform the plank on your knees instead of your toes. You can also make planks easier by doing it on your forearm instead of the hands.

For harder alternatives, complete planks on your hands to raise your body higher. You can also elevate your feet to position your body in a decline. Try different plank variations that include arm and leg lifts, rotations, or positioning yourself on uneven surfaces like medicine balls.

Common mistakes: 

The two most common mistakes when performing planks are arching the back or sagging the hips. These mistakes can put extra weight on your arms and create unnecessary pain.

Side Planks

side plank exercise
Shutterstock

Step-by-step form instructions:

Lie on one side of your body. Put the bottom arm horizontally to your body with your weight on your forearm. Stack your legs with the bottom foot on the edge of your foot. Raise your body to hold the position in a straight line. Repeat with the opposite side.

How many sets and reps to do: 

Side planks should be done with 20 to 60-second holds in two to three sets.

What makes this move so effective:

Side planks focus specifically on the oblique muscles to contribute to a more sculpted and defined ab appearance. The sustained isometric contraction of side planks leads to greater muscle activation and definition. It also improves overall core stability and posture.

Options to make it easier or harder:

The best way to make side planks easier is by holding the workout on your knees. That modification will provide additional stability and reduce the workload on your core.

A simple way to increase the difficulty is by raising your top arm and leg at the same time. You can also add weight on your hip or do the workout on an unstable surface for a challenge. If you don't want to add weight or change the surface, doing hip dips or rotations will make this harder.

Common mistakes:

The common mistakes with side planks include either rotating the hips or dropping them. Not keeping the hips square can put strain on your back, while dropping your hips disengages the core. People performing this also tend to not keep their body aligned throughout the workout, putting additional strain on the neck and back.

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Bicycle Crunches

bicycle crunches
Shutterstock

Step-by-step form instructions:

Lie flat on your back. Raise your knees on the ground as if performing a sit up. Interlock your fingers behind your head. Lift one leg up and extend out while the other leg stays bent in a tabletop position. Rotate the elbow of the extended leg in towards the bent knee. Continue to repeat this motion and increase the speed.

How many sets and reps to do: Aim for three sets of bicycle crunches with 12 to 20 reps completed per set.

What makes this move so effective: This exercise is effective by engaging multiple core muscles – rectus abdominis (six-pack), obliques (side abs), and transverse abdominis (deep core muscles) – at the same time. The twisting motion targets the muscles from different angles to help get a more sculpted and toned midsection.

Options to make it easier or harder: 

Focus on single movements such as keeping your feet flat and just rotating your torso or only extending the legs and not rotating your torso. This can also be done while standing as an easier option.

To make this harder, try slowing down the movement and adding pauses. This will engage your core to take the workout up a notch.

Common mistakes:

Avoid rushing through the exercise. This leads to poor form and a less effective core workout. It is also critical to not pull your neck up, swing your elbows, and hold your breath.

Russian Twists

illustration of how to do the russian twist core-strengthening exercise
Shutterstock

Step-by-step form instructions:

Start by sitting on the floor with your knees bent and feet flat. Lean back in a V-shape. Hold your hands together in front of you. Rotate your torso from side to side and bring your hands down to your side.

How many sets and reps to do:

To reach faster ab definition, the goal should be to complete eight to 16 reps of two to three sets of Russian twists.

What makes this move so effective:

Russian twists provide visible definition on your waistline by specifically targeting the obliques due to the rotational movement of the exercise.

Options to make it easier or harder:

The two best ways to make this workout easier are by keeping your feet on the ground and doing smaller rotations. By keeping your feet on the ground, it will increase your stability. Smaller rotations will help to focus on movement control.

Russian twists can be made harder by lifting your feet off the ground to engage your core more. You can also hold a dumbbell, medicine ball or kettlebell out in front to add weight to the workout. Try variations like leg lifts or leg extensions to make your core work even harder.

Common mistakes:

Poor form is the most common mistake with Russian twists. Be mindful that you are not leaning too far forward or back. Another common mistake is using too heavy of a weight which will ruin your form and making the workout less effective.

Reverse Crunches

reverse crunch
Shutterstock

Step-by-step form instructions:

Lie flat on the floor with your knees in a tabletop position. Put your arms at your side with palms facing down. Press your lower back to the floor and engage your core. Use your abs to lift your hips off the ground and knees towards your chest. Slowly lower your hips back to the starting position. Don't let your feet touch the ground.

How many sets and reps to do:

The goal for reverse crunches is two to three sets of 12 to 15 reps per set.

What makes this move so effective:

This workout specifically targets your lower ab muscles compared to traditional crunches. Reverse crunches require engagement of the deep stabilizing muscles while minimizing hip flexor movement, leading to quicker and more visible ab definition.

Options to make it easier or harder: 

Easier options for reverse crunches include limiting the range of motion, keeping your knees bent, and placing your hands under your hips for additional support. An alternative variation would be single leg lifts.

Make this harder by performing leg extensions or raising your legs higher. If you want to add weight, give ankle weights a try. Ultimately, focus on controlled movements to get the most effective workout for your core.

Common mistakes:

With this exercise, the most common mistake is for people to rely on their hip flexors instead of their core. This means that controlling the movement is important to get the most effective workout possible.

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The Ultimate Core Routine

For the ultimate core workout, these exercises should be combined into a 15-to-20-minute workout that includes three to four rounds with minimal rest between exercises. In order to achieve maximum results, this routine should be done three to four times per week.

An example routine would be:

  • Plank: 30 to 60 seconds
  • Right Side Plank: 30 to 45 seconds
  • Left Side Plank: 30 to 45 seconds
  • Reverse Crunches: 12 to 15 reps
  • Bicycle Crunches: 20 to 30 reps with 10 to 15 per side
  • Russian Twists: 20 reps of 10 per side

What Results to Expect

Realistic expectations after four to six weeks include stronger core muscles, improved posture and stability, increased core endurance, and a more defined midsection.

Advice for Beginners

The key as a beginner is to find a routine that works for you, one that you know can remain consistent. It is also critical to remember that while these exercises are crucial, it is just as important to pair the workouts with a healthy diet to maximize results. And if you enjoyed this article, don't miss How Long Your Walking Workout Should Be To Shrink Belly Fat.

Josh York
Josh York is a Certified Personal Trainer, Founder & CEO of GYMGUYZ. Read more about Josh