After yesterday's 1-1 draw at Boston United, Martin Allen admitted that the players were not as sharp as in their opening pre-season game, but says he is pleased with their fitness levels.
Boston, who play in the National League North, made the brighter start and took a deserved lead through a wonderful strike from Adam Marriott.
The Spireites levelled soon after when Zavon Hines drilled home from the edge of the box.
Speaking after the game, Allen said: "It was a slow start and we didn't really get going into top speed. However, when you reflect on it, that's the first game for a lot of players - for some it will be their first match in a couple of months.
"We've trained very hard this week, especially on Thursday, with the aim of getting everyone fit for a few weeks' time. I think that probably took some energy out of those younger players and perhaps some of our older ones, too."
Allen made a handful of substitutions after the break with Laurence Maguire, Curtis Weston, Jerome Binnom-Williams, George Smith and Robbie Weir all coming on.
"We changed it around and freshened up a little bit, and those lads that came on dominated the game, but we never made a chance," Allen added.
"I don't think we were anywhere near as sharp as we were against Sheffield FC, but overall I know that behind the scenes we're fitter. The good points today are that I've managed to see all our players - some of them boys have done really well and I'm pleased with them.
"Just about everybody's played about 90 minutes now and by the end of next Saturday every player will have played at least 90 minutes and have had a good run around to improve their fitness levels, which is what it's really about."
Next up for the Spireites is another trip into Lincolnshire on Tuesday night, this time to face Gainsborough Trinity.