The Tottenham Hotspur players have been feeling the burn after their first few days of training under Thomas Frank.
The first group of Spurs players have returned to Hotspur Way and after their initial tests and blood work, they began working on the training pitches with Frank and his big new-look coaching staff.
Out there on the pitches were players like Dominic Solanke, Pedro Porro, Lucas Bergvall, Guglielmo Vicario, Yang Min-hyeok, Dane Scarlett, Djed Spence, Antonin Kinsky, Brandon Austin, Ashley Phillips, Jamie Donley, Alfie Devine, Josh Keeley, George Abbott and Will Lankshear. Newcomer Luka Vuskovic was involved as was Argentine striker Alejo Veliz before his loan move back to Rosario Central.
The international players will return later this week before those who played at the U21 and U19 European Championships arrive back a few days later.
Here are five things we noticed from the training footage put out by the club from Frank's first session at the Enfield training complex coupled with what we know.
Conte flashbacks
While not quite to the same degree, the 1km worth of fast shuttle runs the players were put through and the subsequent reactions brought back memories of an Antonio Conte pre-season tour moment when the Italian's session terrified the population of South Korea.
Back in 2022, after two hours of training in the Seoul World Cup Stadium in high temperatures and humidity, in which the Tottenham stars were put through various drills, match situations and two-touch and multi-touch matches, Conte unleashed his renowned pre-season nightmare on the players - 42 pitch-long runs, with very few brief stops, to see who lasted the distance.
Harry Kane was sick by the side of the pitch, Son Heung-min collapsed to the floor at one point to scared silence from the fans in his homeland and it was certainly an exhibition from Conte, with some inside the club believing he did it to show the levels of his training in front of the public, while the sessions behind closed doors never reached that level.
This year's effort under Frank was not to that level. It was a far shorter 1km run at pace, but it still was done to a fast level that left the players exhausted and lying on the grass afterwards in the sunshine as they raced each other. The new head coach went around them all high fiving them and smiling as they tried to catch their breath to speak.
Speedy Abbott
It might not have been a surprise to those inside the club but 19-year-old George Abbott was the fastest to complete the 1km run. The midfielder, who had a great season on loan at Notts County in League Two, is known to have a terrific engine on him and he flew through the distance leaving most others in his wake.
Dominic Solanke came in second with Jamie Donley third and Alfie Devine fourth while many of the senior stars followed behind them.
The Tottenham coaches could be heard shouting to Abbott in encouragement during the run and he did not look half as knackered as his team-mates did afterwards.
Veliz's awkward final moment
The same could not be said for Alejo Veliz in what we now know was his final training session before returning home to Argentina on loan to Rosario Central.
The 21-year-old striker was among those who looked a bit worse for wear after the fast run in the sunshine. Veliz looked more shattered than most, shown by the cameras left sitting alone on the grass before waving a horizontal palm side to side towards the camera, suggesting he was done.
It proved to be something of an awkward final moment for Veliz because his time at Tottenham for this season was certainly done and perhaps for the long term.
Porro advice and early return
If you're looking for great character and top professional, look no further than Pedro Porro. The 25-year-old should really have been part of the group of international players returning later this week after playing in the Nations League with Spain and reaching the final last month.
However, the right-back returned early and was using the club gym on Friday before coming back to sessions with the squad in the days after. As one of the senior players among the group he could be seen dishing out words of advice to teenager Yang Min-hyeok at one stage.
As Porro put his arm around his shoulder, the South Korean was saying something about what he could see the defender doing and Porro in turn could be heard telling him about 'the most important thing to do'. We'll maybe never find out what that was but he was certainly looking to help the young winger.
New face and Cochrane's promise
New strength and conditioning coach Tom Perryman, who has made the trip across with Frank from Brentford, could be seen speaking to Dominic Solanke at one point.
Among Frank's large coaching staff is a returning face in Justin Cochrane. The 43-year-old was an academy coach at Tottenham before joining the England set-up and later Brentford.
Now he is back at Hotspur Way as one of the Dane's right-hand men and he was shown speaking to the players at the end of the session. He made it very clear that things will continue to step up.
"What we're going to do is we're going to take it up all the time. We're going to get better at these sorts of drills which take it into the bigger picture," he said. "It's basically about taking up the right positions, passing details, and knowing your way out, in terms of knowing that if Pedro has the ball and he is being pressed by Dom and Dom's left Luka, as Pedro plays me in here, I'll now play in there, okay?
"It's hard to turn in these little practices when there are so many people congesting, then also looking for what I call long line passing or passes down the line or diagonal passing. It's the first day. Top effort over there. Real good energy."
Frank will be hoping that his Tottenham team take that good energy into the season so his era can get off to a fast start.