Getting buff requires you to build weak muscles to even out your physique. Sign up for a fitness test with a personal trainer at the gym, if you are unsure where you are weak. They can test your aerobic and strength and give you some areas to work on. These will keep your workouts on track and allow you to hit milestones as you change your body's shape.  For example, your cardio goal may be to run 2 miles (3.2 km) in 15 minutes. Interval training, using sprints and moderate exertion can help you reach your goal, by running 3 or 4 times per week. For example, your strength goals may be to do 10 push ups in 2 months. These goals will differ greatly between men and women for the most part. Men may want to build more muscle mass, while women may want to build lean muscle mass. The difference is in the execution of your Weightlifting. Include weight loss goals, if they apply to you. You can still get buff and gain muscle mass while losing weight. While Weightlifting speeds up your metabolism, you will need to spend an equal amount of time doing aerobic exercise to burn more fat off your body. Divide the goals up into 4 or 5 smaller touchstones, so that you can monitor your progress. Try to fit in Weightlifting 3 or 4 times per week with a day of rest in between, cardio at least 3 times per week for 30 minutes and body weight exercises 3 to 4 times per week. Add in stretching to cool down each day. Don't forget to take rest days. If you feel you are doing too much or you are exceptionally tired, take a day for your body to recover. Alternate Weightlifting and cardio days, during the majority of the week. Pay attention to your body so that it can rebuild stronger muscles while you rest.

TL;DR in Chinese:
从你身上最薄弱的地方开始练。 设定力量和有氧训练的目标。 写下目标。 定一个健身房计划。