Weight training also supports your joint structure which is a major prevention for future joint problems with knees, shoulders, and back. For instance, the main vertebral column’s support is our back muscles. As we age and muscles atrophy (without use), the support of the column becomes weaker. The spine can begin to compress on nerves and disks wear away. Weight training will build the back muscles and continue to support the spine. This can help prevent or avoid many back imbalances and injuries.