With all manner of fitness testing to be done, pre-season is relished by few of the players - but for Mal Purchase it gives him essential information for the season to come.
Chesterfield's strength and conditioning coach uses the preparatory time to run the rule over the returning fitnesses of the Spireites squad, as well as finding out what each player is capable of and how to get the best out of them throughout 2016/17.
"It's been good, we've been testing," said Purchase on the first day back. "All the players have had an off-season program and we've worked off the GPS data we've received from that with the amount of high-speed running, accelerations, decelerations, sprints and the distance and duration of their training.
"It means we have a lot of data from them now, and we've had testing done at Leeds University, including DEXA scans for their body fats and bone density. There were also TMG tests there which tests the muscles and their strength.
"Today we've done jump testing for leg power and our sprints, doing five metre, ten metre and 20 metre sprints. We've done agility tests and yo-yo tests, so we know their data from last season and where they are this season.
"They've all come back better than what they were this time last season."
With all the data to be analysed and worked through, Purchase points out that the testing isn't for testing's sake, but to ensure the squad is in the best shape to improve and go forwards.
"This is the busiest time of the year for a conditioning coach, this is where we get all the testing data - but it's no good getting all the data if you're not putting a plan together to improve the results.
"We've got a lot of gym work to do, while most of our football conditioning work is done with footballs. We've had the footballs out even on the first day and on day two we start our proper football starting with 11 v 11s and on to the 7 v 7 and 3 v 3s where you pick up the sharpness.
"They will be where we want them to be by August, we had a good start last season and there's no reason why we can't get a good start this season."