Welcome to you and Indy both!
Don't worry about tiring her. She's young and has tons of energy. Exercise is good for them and helps their organs to work well. She will "tell" you when she is tired. Generally, they will look up at your face or do something that will tell you they're tired and want to go back. Eventually, you will "understand each other" better and when she communicates with you thru looks or body language, you will understand when she is tired.