«A six-pack in 30 days» is one of the most popular promises of the fitness industry. In a month you really can noticeably strengthen the abdominal muscles, but whether they will become visible depends mostly not on the number of crunches. The editorial team explains what can realistically be changed in four weeks, why local «burning» does not work and how to build expectations.
«Getting abs» — what exactly is meant
By «the abs» people usually mean the rectus abdominis muscle — the one that forms the characteristic «six-pack». In reality the muscles of the abdominal wall are a whole complex: the rectus, the external and internal obliques, the transverse abdominal muscle. Together with the muscles of the back, the pelvic floor and the diaphragm they stabilize the spine and transmit force between the upper and lower parts of the body.
«Cubes» are not separate muscles but sections of the rectus muscle, divided by tendinous intersections. The number and symmetry of these intersections are determined anatomically: some people show six «cubes», others four or eight, and training will not change this.
When people say «get abs», they may mean three different goals: to make the muscles stronger and more enduring, to increase their thickness or to make them visible. The first two depend on training, the third — primarily on the amount of fat over the muscles.
The rectus abdominis muscle is present even in people who have never trained. Everyone has it — the only question is how developed it is and whether it is hidden by a fat layer. Therefore an honest answer to the question in the title begins with clarifying the goal.
Why the abs aren't visible: the role of the fat layer
The abdomen is one of the main zones of fat accumulation, especially in men. Fat here is of two types: subcutaneous, which lies over the muscles, and visceral — inside the abdominal cavity around the organs. Subcutaneous fat hides the definition, visceral «pushes» the abdomen forward and is connected with metabolic risks.
Clear abs definition in most men appears only at a fairly low percentage of body fat. The exact threshold is individual and depends on genetics, fat distribution and the thickness of the muscles themselves, so universal figures do not exist. In women the physiological minimum of fat is higher, and abs definition usually requires even stricter control.
Hence the obvious conclusion: if you now have a noticeable layer of fat on the abdomen, no ab exercise program will make the cubes visible in a month. For this you need to reduce the total fat mass, and that is a process that requires time.
A safe rate of weight loss, which most guidelines consider realistic, is about 0.5–1% of body weight per week. That is, in a month you can lose several kilograms, of which not all the loss is fat. A person who needs to lose 10–15 kg to reach definition will consciously not have enough time in a month.
The myth of local fat burning
The most common mistake is to think that exercises on a certain part of the body burn fat exactly there. This idea is intuitively understandable, but physiology works differently: during a load fatty acids are mobilized from the fat depots of the whole body, and where exactly from is determined by hormonal regulation and genetics, not by which muscle works.
The randomized study by Vispute and co-authors (2011) tested this directly: 6 weeks of ab training did not reduce either abdominal fat or waist circumference compared with a control group, although the endurance of the abdominal muscles increased. Similar results had earlier been obtained in other studies of local exercises.
Some works found a small local effect, but its magnitude at best is negligible compared with the influence of the overall energy deficit. For practice the conclusion is unambiguous: hundreds of crunches a day will not replace nutrition.
«Fat-burning» belts, creams and wraps do not work either. They can temporarily reduce the amount of water in the skin through sweating, but this has nothing to do with fat. «Fat burners» will not help either, and potent weight-loss drugs, which are sold in the sporting environment without a prescription, pose a real danger to health.
What is realistic in a month
If you set aside the marketing, in 4 weeks of systematic exercise you can achieve a noticeable result — just a different one than «cubes from scratch». The strength and endurance of the core muscles grow already in the first weeks, primarily thanks to neuromuscular adaptation.
| Starting state | Realistic result in a month |
|---|---|
| A significant excess of fat | Reduction of the waist by a few centimeters, a stronger core; the cubes are not yet visible |
| Moderate fat, definition barely visible | The upper «cubes» may become more noticeable with a calorie deficit |
| A low percentage of fat | Clearer definition due to hypertrophy and a reduction of water/fat |
| Any | Better posture, stability, endurance of the core muscles |
Hypertrophy of the rectus abdominis muscle in a month will be small, like that of any other muscle. A noticeable increase in thickness requires several months of training with progressive load.
Visually the «effect» over a short time is sometimes enhanced by reducing the amount of water and intestinal content — this is what fitness models do before a photo shoot. This is a temporary result that does not reflect a real change in body composition, and it has nothing in common with a healthy form.
Realistic expectations protect against disappointment. A month is an excellent start, after which it is worth continuing rather than considering that «it doesn't work».
A smart 4-week plan
Nutrition is the first priority. A moderate calorie deficit, sufficient protein (roughly 1.6–2.2 g/kg of body weight during weight loss for people who train), vegetables, a minimum of liquid calories and alcohol. Harsh diets will give a faster minus on the scales, but a greater loss of muscle and a higher risk of breakdown.
The second is strength training for the whole body 2–4 times a week. Basic exercises — squats, deadlifts, presses, pull-ups — heavily load the core and expend more energy than isolated ab exercises. They also help preserve muscle mass in a deficit.
- ab exercises 2–4 times a week: crunches, hanging leg raises, the «wheel», the plank and its variations;
- progression: increase the resistance or complexity, not just the number of repetitions;
- for the oblique muscles and stabilization — side planks, «anti-rotation» exercises;
- a daily step count as a simple way to increase energy expenditure.
The third is sleep and stress. Sleep deprivation increases hunger and reduces the ability to follow the plan. Chronic stress is associated with the accumulation of visceral fat, so recovery is also part of the «program for the abs».
The fourth is measurement. Instead of daily weighing, record the waist circumference once a week, take photos under the same conditions. This way progress will be more noticeable and less dependent on water fluctuations.
Editorial conclusions
Strengthening the abdominal muscles in a month is realistic, but making the cubes visible from scratch is not, if there is a noticeable layer of fat over the muscles.
The visibility of the abs is determined primarily by the overall percentage of fat, and reducing it requires a calorie deficit and time. Local fat burning by exercises does not exist.
A month is a good start: a stronger core, a smaller waist, a habit of training. Further on the result accumulates.
We also recommend reading: «Is It Harmful to Train Every Day», «Is It True That Muscle Turns Into Fat» and «Obesity and Estrogen in Men».
References
- Vispute SS, Smith JD, LeCheminant JD, Hurley KS. The effect of abdominal exercise on abdominal fat. J Strength Cond Res. 2011;25(9):2559–2564.
- Katch FI, Clarkson PM, Kroll W, et al. Effects of sit up exercise training on adipose cell size and adiposity. Res Q Exerc Sport. 1984;55(3):242–247.
- Helms ER, Aragon AA, Fitschen PJ. Evidence-based recommendations for natural bodybuilding contest preparation: nutrition and supplementation. J Int Soc Sports Nutr. 2014;11:20.
- Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition position stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20.
- Garber CE, Blissmer B, Deschenes MR, et al. American College of Sports Medicine position stand. Quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults. Med Sci Sports Exerc. 2011;43(7):1334–1359.
Andriy Melnyk
A strength-sports coach and author of programs for beginner and intermediate levels. Writes about training planning.
