A number of factors go into being a strong runner. Taking daily action to prevent injuries is huge, good balance is important, and a strong core is vital. The ability to breathe evenly should also being taken into account, as some of us hold our breath when we're stressed out without realizing it.
Practicing Hatha, Vinyasa, Iyengar, and various other styles of yoga is an amazing way to keep your muscles flexible, strong, and mobile. All those tree poses and arm balances are great for balance and core strength, and practicing breathwork will make even breathing second nature.
"Yoga will stretch tight muscles and loosen up stiff joints that would otherwise be compromised," Dr. Alicia Armitstead tells mbg."[Practicing yoga regularly] will therefore decrease the risk of injury during running. "