In his opinion, you should never neglect the warm-up at the start of your workout, and stretching at the end. They're essential for avoiding injury and aches.
Drink plenty (preferably water - vodka isn't great for your fitness) to prevent cramps and tendinitis, and lead a healthy lifestyle. "A healthy diet optimises your physical abilities," Adrien tells me.
But that shouldn't stop you from enjoying yourself a little from time to time. And just like that, you're back in the game!