Motivation
Training with a team helps to motivate, encourage and challenge every teammate. Knowing that you are rubbing shoulders with your teammates, going through the same pain, builds camaraderie and reach your team goals.
Better results
Training with a team creates an environment that naturally allows you to push yourself harder, train at a higher intensity which ultimately gets you to your goals faster.
Accountiablty
It's human nature to want to please people, training with a team creates a sense of not wanting to let your teammates down. Having a team that shows up and is waiting for you to show up makes the chances of you skipping a workout decrease.