Participating players were paired up for a high speed boxing session lasting almost an hour, with the boys working hard for every moment - only stopping for a short break.
The sweat was pouring off each player and hawthornfc.com.au got up close and personal to some of the players to give fans an insight into how tough the session was.
Matt Spangher feels the pinch during the boxing session.
Liam Shiels has worked very hard this pre-season and he kept up his good form during the session.
Brendan Whitecross was paired up with Cyril Rioli - both were taking the session seriously.
Defender Ryan Schoenmakers was working as hard as anyone, and here's the evidence to prove it.
There was a size difference between Kaiden Brand and Luke Breust, but no difference in intensity levels. Luke Breust working really hard.
These two were locked in an intense session and had great chemistry with the gloves on.
You can see how intense it was, with sweat pouring off Jack Gunston.
Shane Savage has been working hard in the gym during the off-season and was enjoying his box with Jed Anderson.
Rioli swapped partners to Liam Shiels, but it was just as intense.
...And here's the proof.
It was painful for Jordan Kelly, just ask him.
Don't mess with Derick Wanganeen, he means business behind his helmet.
Whitecross ended up in a session with fitness guru Andrew Russell and felt the pain that comes with it.
Ex amateur boxer Mitch Hallahan turned back the clock in the gym on Tuesday.
