Mark Duffy clearly worked up a sweat as United were put through their paces by GB Boxing at the EIS on Thursday.
Speaking after packing a punch or two in vigorous boxing session, the experienced winger commented: "It was tough, really tough, but it brings us out of our comfort zone and presents us with something different that we're not used to.
"Everyone comes and enjoys it, it's tough, but enjoyable and that always helps."
On United's big hitters, Duffy added: "Jack (O'Connell) is a hitter, although a bit heavy handed and Nathan (Thomas) impressed the lads with his speed and power.
"But there were a few that looked decent to be fair and a few that weren't as quite as impressive too!"