Staying on your feet in the ring is a challenge for any boxer, but one soldier has managed to do it for a staggering 24 hours.
WO1 Nathan Allan took part in the challenge at the Royal Military Academy Sandhurst to raise money for charity.
The boxing enthusiast managed to complete 218 rounds before finally stepping out of the ring.
He's managed to raise almost £4,000 in aid of Cancer Research UK but needs a little more to reach his target - click here if you'd like to help him.
Click below, meanwhile, for Cath Brazier's full interview with Nathan.