The self-proclaimed Gypsy King trained with his old friend in a video posted yesterday, as he continues to get ready for a comeback later this year.
He was filmed unloading his jabs on a punch bag alongside Saunders and another fighter.
Fury, 6ft 9in, appeared to put all his might into each and every blow – unleashing a determined grunt after every connection.
Saunders – fresh from his impressive win over David Lemieux last month – then did the same.
But despite weighing over 40kg less and being nearly a foot shorter, viewers claimed the 26-0 middleweight showed more power than Fury.
“Billy Joe’s hitting harder than Fury,” one commented.
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Another added: “BJS makes Fury look awful.”
And a third commented: “Look at the state of Tyson and he thinks he can take Anthony Joshua this year.”
Fury hasn’t fought since beating Wladimir Klitschko in November 2015, having been suspended for testing positive for a banned substance.
Tyson Fury's ROLLERCOASTER career – in pictures

But he took a huge step towards a boxing return after UK Anti-Doping cleared him last month.
The 28-year-old now needs his licence reinstated by the British Boxing Board of Control before his comeback is confirmed.
If he does return, Shannon Briggs has been tipped by bookmakers Betfair as his likeliest opponent, offering odds of 2/1.