Even when you're trying to gain weight, including regular aerobic activity is healthy and beneficial to your lifestyle.  Cardiovascular exercises strengthen your heart, improve or manage some chronic health conditions like high blood pressure or diabetes, and give you more stamina throughout the day.  Cardio exercises can include:  jogging or walking, biking, swimming or hiking. Always monitor approximately how many calories you're burning through exercise.  You'll need to calculate this into your total goal. If you're performing aerobic exercises and are having trouble maintaining your weight or you're continuing to lose weight, you may need to decrease the intensity, frequency, or duration of your aerobic exercises. Strength training can aid in your weight gain.  As you build lean muscle mass, you may notice your weight increases. This is highly important when attempting to gain weight. Many people do not realize that exercise is crucial to weight gain, just as it is to weight loss.  Strength training activities include:  weight lifting, isometric exercises (push-ups or crunches) and Pilates. Strength training does burn calories, just not as many as aerobic activities.  However, it's still important to be aware of how the calories burned during these exercises affects your weight. Seeing a personal trainer may help you find the appropriate workout schedule for you.  A personal trainer will be able to guide you through specific exercises or routines that can help keep you fit and maintain or add weight.  Check at a local gym for a trainer.  Many times you can see a trainer there and they may even offer a discounted consult for your first visit. Talk to your trainer about your weight and goals.  Make sure they understand you're interested in healthy weight gain.

How would you rephrase that briefly using Vietnamese?
Tập aerobic (bài tập tăng nhịp tim) thường xuyên. Thử bài tập tăng cường giúp cơ chắc khỏe. Gặp huấn luyện viên.