Heavier weights and increase repetitions.
Increase the level of activity as desired and consume the appropriate amount of food and water for your specific metabolism and health, consider speaking with a doctor or health consultant.
If you have good cardio respiratory endurance, then you'll be able to do rigorous physical activity for longer amounts of time, because like other muscles in your body, the more you stretch them the stronger they get and the longer they would last.
Hope that helps and makes sense :)
