Fitness marketers know what buzzwords make consumers believe their product is the best for a "tighter core." But c'mon, most of them just want your cash.

Save yourself the dough and use that thing you dry your dishes with for a cheap but intense core workout.

Brad Lloyd, a personal trainer in New York City, has developed a workout technique using just two dishrags. The man knows fitness; prior to his nine years of personal training experience he was a linebacker for Eastern Michigan University.

See also: How to use your local park for a kickass workout

Image: Mashable Brittany Herbert

The "rag training" moves consist of repeatedly sliding a rag with your hands or feet to stretch and contract muscles. "The result is a complete full-body strengthen workout that challenges core balance, improves flexibility and movement control by the forces acting upon the body and the rag, and helps one’s muscular toning," says Lloyd. He maintains that regular rag training can also help body posture, an important part of a strong body.

The workout is for any level of fitness. All you need is enough floor space for your height and two regular rags. It sounds simple, but this is by no means an "easy" workout.

1. Sliding Reverse Lunge

Foot on rag, slide foot back and bend your opposite knee to form a 90-degree angle between your thigh and calf, while lowering your knee toward the floor. Slide yourself upward with your thigh muscles and return back to the starting position.

Focus: Quadriceps, hamstrings Secondary: Glutes, lower back, abdominals and obliques

2. Lateral Sliding Lunge

Stand up straight with one foot on the rag and the other placed firmly on the ground. Push your hips back and slide out to your side as you lower hips and bend your other knee. Place both hands on your hips or raise your arms out in front of your chest as you descend. Keep your weight on the heel of your supporting foot.

Focus: Hip abductors, adductors Secondary: Glutes, lower back, abdominals and obliques

3. Floor Knee Tuck

Image: Mashable Brittany Herbert

Get into a pushup position with two rags under both feet, toes down. Slide your knees and feet under your body and chest until the knees cannot bend any further. Slowly straighten your knees and hips from under you back to the starting position.

Focus: Lower, upper, and transverse abdominals, obliques and lower back Secondary: Biceps, triceps and shoulders

4. Circle Knee Tucks

Get into a pushup position with two rags under both feet, toes down. Slide your knees and feet under your body and chest in a clockwise/circular motion until the knees cannot bend any further. Slowly straighten your knees and hips from under you, back to the starting position.

Focus: Hip abdutor and adductors Secondary: Gluteus, lower back, lower and transverse abdominals, obliques

5. Knee Curls (Beginner)

Lie in an upright position resting on your forearms with two rags under both feet, heels down. While planting your tailbone down, slide your feet and legs under, toward your lower back. Slowly straighten your knees knees and hips from under you, back to the starting position.

Focus: Hamstrings, gluteus Secondary: Lower back

5A. Knee Curls (Advanced)

Lie in an upright position resting on hands or forearms with your tailbone raised, holding your body up. Slide your feet and legs under towards your low back. Slowly straighten your knees knees and hips from under you back to the starting position.

Focus: Hamstrings, gluteus Secondary: Lower back

6. Saws (Beginner)

From a kneeling position, place two rags under both hands, making sure your shoulders and hips maintain a neutral alignment and arms straight. Grind into the floor with the palm of your hands and slide the rags forward as you lower your hips toward the floor until your chest reaches the floor. At that point, slide one arm in, under your chest, then the opposite arm. With both arms, push your body back into the starting position.

Focus: Shoulders, biceps, triceps Secondary: Upper and lower abdominals

6A. Saws (Intermediate)

From a kneeling position, place two rags under both hands making sure your shoulders and hips maintain a neutral alignment and arms straight. Grind into the floor with the palm of your hands and slide the rags forward as you lower your hips toward the floor until your chest reaches the floor. At that point, slide both arms in simultaneously under your chest. Repeat the cycle in a fluid motion.

Focus: Shoulders, biceps, triceps Secondary: Upper and lower abdominals

6B. Saws (Advanced)

Image: Mashable Brittany Herbert

From a pushup position, place two rags under both hands making sure your shoulders and hips maintain a neutral alignment and arms straight. Grind into the floor with the palm of your hands and slide the rags forward as you lower your hips toward the floor until your chest reaches the floor. At that point, slide both arms in simultaneously, under your chest. Repeat the cycle in a fluid motion.

Focus: Shoulders, biceps, triceps Secondary: Upper and lower abdominals

7. Chest Fly

From a pushup or kneeling position, place two rags under both hands making sure your shoulders and hips maintain a neutral alignment and arms straight. Grind into the floor with the palm of your hands and slide the rags out to the sides away from the body, keeping your arms moving out across the nipple line, allowing your hips to move towards the floor until your chest reaches the bottom. At that point, slide both arms in simultaneously, under your chest. Repeat the cycle in a fluid motion.

Focus: Shoulders, biceps, triceps Secondary: Upper and lower abdominals

8. Dynamic Chest Fly

Image: Mashable Brittany Herbert

From a pushup or kneeling position, place two rags under both hands making sure your shoulders and hips maintain a neutral alignment and arms straight. Grind into the floor with the palm of your hands and slide one rag out to the side while simultaneously sliding one away from the body up toward your head. At that point, slide both arms in simultaneously, under your chest. Repeat the cycle in a fluid motion.

For questions or to contact Brad Lloyd, see hisFacebook page or email Info@mytrainerbrad.com.

Workout descriptions edited for brevity and clarity.