You can increase your fitness level in a variety of ways. Whether you want to improve your cardiovascular endurance or increase your strength, flexibility and power, there are many exercises that will help you do these things. Some of your options include cardio activities, such as running, swimming or cycling or resistance activities such as weightlifting and body-weight circuits. You may train by yourself or with a group, work out inside or outside, join instructor-led classes or work one-on-one with a coach.
Training frequency is the most important aspect of improving your fitness. Whatever your goals are, you need to be working out on a regular basis to see any improvement. For most people, three to five exercise sessions per week is effective. Each workout should last between 30 to 60 minutes.