Toward the end of the Olympics, you get physically tired and drained. And no matter how much rest you have, your body is tired.
I know Seth Rollins is a CrossFit guy. I just think back to my days, and I don't know how I could have done CrossFit training and then wrestled that night.
When I came back into the side in 2009 I had to play more aggressively, and did. But I should never have played 127 times for England in one day cricket.
It's so uncommon for athletes to push themselves the way they do and not have injuries as a result.
A pitcher's arm goes, and they're done.
People think footballers are all like robots - we can control everything on the pitch. But your heart is beating 200 times a minute; it's very, very physical.
There's no doubt about it; playing football and how tough it is on the body afterwards.
The game takes a toll on your body.
A lot of people don't realise how mentally tough the Premier League is.
Swimming is probably the ultimate of burnout sports.
You imagine running 120 miles a week, week in, week out, for the past four or five years. It takes a little bit out of you.
It's very difficult in England because the season is very long and hard compared to other places. There's not a lot of recovery time at all, not even a break at Christmas. You just have to do your best and get on with it.
It's impossible for one player to play the whole year. I've learnt that myself, and you're always bound to get injuries.
I've beaten all contenders for 11 years. I'm not a robot; I'm fed up. My body's tired of it. I'm 36.
I lived on being a quick player and my hamstring was breaking every time I made a quick move. I wondered what the hell was going on.
The thing is the game is getting tougher and tougher and we have to ask a lot of our bodies.
Sometimes you have a good game and mentally you are very tired.
Fitness is defined differently by everyone, but for me, the most important thing is being healthy. As tennis players, what we do is not the healthiest thing. We almost abuse our bodies.
The first rounds of a tournament are always tricky because playing tennis takes a lot out of you.
Just about every player on tour has a bad back. It's just one of those games that does mess you up a little bit. You've got to keep looking after it.
Only players can understand what it's like, travelling and playing every three days, it gets on top of you.
The thing I don't miss is waking up in the morning, hurting, the grind of the game.
Football wears you out, and when things are not going well, it's not enjoyable.
Pro wrestling is so physical and taxing and just hurts your body; it's very aggressive entertainment.
The time leading up to the 1996 Olympics was the most demanding and stressful of my career. The sport I had loved so much was slowly becoming a nightmare as I trained with Bela and Marta Karolyi the summer before the Olympics.
