. Keeping your core strong isn't something that's going to happen in a workout or two. If you want strong, tight abdominal muscles and a flat stomach, it requires consistent exercise and healthy eating to maintain. To make it easier on yourself, find an exercise routine that you enjoy.  YouTube, Muscle & Fitness, and a variety of other sources all feature free workout guides and different circuit training routines that you can follow. Find one you like and try doing it 3 times a week. Plug in some tunes and follow along. It's way easier than trying to do it yourself. If you prefer, some people like to switch it up regularly and try out different things. Do a workout for a week or two, then find a new one. Keep changing it up to avoid getting bored. ocus on calorie-burning exercises to emphasize your core strength. If you're working hard, you don't just want to feel results, you want to see them. As you work out your core, focus on burning calories and shredding fat around your midsection, to make sure your hard work shows.  Even if you're working hard to tone your core, that layer of fat around your midsection can be hard to get rid of with strength training alone. Cardio exercise is the best and quickest way to get rid of that layer of fat, to put your toned core muscles on display.  Add three 30-40 minute cardio workouts to your exercise routine per week to help you trim fat, or do your core exercises in rapid succession, with 15-30 second breaks in between them for a rapid circuit-training workout. . Tightening your core requires total health, not just strong abs and back muscles. If you want to see results, you need to focus on building muscle and dropping fat, which requires a fair amount of cardiovascular exercise in addition to your core-training exercises.  Circuit training refers to doing a combination of the kind of exercises described in this article, but at a quick pace with short, timed rests in between. Find a group of 10 exercises you like doing, then block them out into 60 second chunks and 30...

TL;DR in Chinese:
制定一个自己喜欢的训练计划。 着重在燃脂训练上，以此增强核心功能。 全面的健身运动。 多吃全麦、优质蛋白、富含维生素的蔬菜。 补充水分。 尽量避免压力。 运动过后让身体得到充分的恢复。