Thats where the everyday activities like biking, running, team sports etc comes in to play. Lifting heavy will make you strong, using that strength every day will give you muscles more stamina. That is, of course, if your training involves more things than just hitting the gym
Powerlifting combined with endurance training (such as the things above) made my knee with almost no natural support more stable than anyone thought was possible. That being said, one-sided training isn't very effective if you like sports where you need both strength and stamina.
SkiLogik Contour Röjk superwear
"Why would he be a nice person? Not like he has a soul or anything" - Miomo on Shaun White