Physical: Working Out Over 40

• decreases by 3-8% every decade after age 30.
• Increase your aerobic exercise: The World Health Organization and the Centers for Disease Control and Prevention (CDC) recommend at least 150 to 300 minutes of moderate exercise or 75 to 150 minutes of vigorous aerobic exercise a week.
• Eat more protein: You can get outside and eat more protein to stop muscle loss.
• Burn calories: As you get older, your metabolism slows down, so you need fewer calories to fuel your body.

Other tips include: 

• Stretching before every workout.
• Taking a slow starting routine that includes aerobic exercise, like biking or a treadmill, and sensible weight training.
• Allowing time for recovery.
• Cutting back on carbs.
• Reducing portions.
• Eating healthy fats.

You can build your training up gradually to three or four hours a week. If you feel out of shape, you can start slowly. 

You should see your physician for an evaluation before starting an exercise program.