Push-ups are a compound exercise that primarily targets the chest, shoulders, and triceps. While they also engage the core muscles for stability, they are not primarily an abdominal exercise.
If you were to perform 100 push-ups a day for a month, you would likely see improvements in upper body strength, especially in the areas I just mentioned. Your chest muscles would become more defined, and your triceps and shoulders would also benefit from the consistent workload. As for your core, because it acts as a stabilizer during the push-up movement, it would gain some endurance and strength. This would be particularly noticeable if you started from a point of limited core strength.
However, achieving visible six-pack abs is predominantly about reducing body fat percentage. Your abdominal muscles might already be developed, but if they’re covered by a layer of fat, they won’t be visible. While doing push-ups can burn some calories, the exercise alone might not create a significant caloric deficit to shed that fat covering the abs, especially if there aren’t accompanying changes in your diet or other aspects of your fitness routine.
So, while 100 push-ups a day for a month will certainly benefit your overall fitness and might slightly enhance your core strength, if your primary goal is to reveal a six-pack, you would need to focus more on nutritional adjustments to reduce body fat and incorporate more direct core exercises like planks, leg raises, or Russian twists.
For a prominent and visible six-pack, a combination of strength training, core-specific exercises, and a calorie-aware diet will yield the best results. Push-ups can be a part of that strategy, but relying solely on them might not lead directly to the visible abs you’re hoping for.