In addition to weakening your immune system, you could also injure yourself, he warned.
“The most common sorts of injuries you might pick up are muscular stains, joint issues and tendonitis – which is a painful inflammation of a tendon usually triggered by overuse,” he said.
People pick up tendonitis quite regularly when they’ve increased their training so it is important to think carefully about frequency, intensity, time spent and type of exercise, he advised.
What training approach does he advise?
“If you’re starting a new regime, you might want to do an extra session one week, but don’t make that session harder as well,” he said.