Summarize the following:
Sturdy, hardwood trees are the best for installing swings. These include oak trees, sugar maples, or ash trees. Avoid putting swings on pine trees or fruit trees. Both the tree and the individual branch need to be healthy and strong to hold a swing. Make sure that the tree is not diseased or infested with bugs. The branch should not be cracked or peeling. Never attach a swing to a dead branch. If you’re uncertain about the condition of the tree, ask an arborist to check it out for you. The branch should make an “L” shape as it extends from the tree. You will need a branch that is at least 6 feet (1.8 m) long.  The branch should not be more than 20 feet (6.1 m) off the ground. The swing will need to be at least 3–5 feet (0.91–1.52 m) away from the trunk so that it does not hit the tree. It also shouldn't, however, be near the end of the branch, where it is weakest. The branch should be very strong in the middle. The branch needs to be thick enough that it will not break under the force the swing exerts. Make sure that the branch does not get significantly narrower as it goes out from the tree.

Summary:
Select a hardwood tree. Evaluate the condition of the tree and branches. Find a long branch that is parallel to the ground. Look for a branch that is at least 8 inches (200 mm) in diameter.