Chesterfield's pre-season programme begins with a game at nearby Matlock Town on Thursday evening (kick-off 7.45pm), followed by a trip to Buxton the following night.
Manager Dean Saunders has confirmed that all the available senior players will be given a run-out in the two games, playing 45 minutes each.
In an exclusive interview with Spireites Player, Saunders said: "It will be a relief for some of them because once you get the first game under your belt, all the tough stuff normally stops and you move on. We'll use the next two games to progress from what they've been doing.
"We'll use them as training games. They'll be wearing their GPS vests and we can see exactly what it takes out of them and where they are up to. Everything is geared to them peaking for the Barnsley game."
To help monitor the players' performance in training, new strength & conditioning coach Mal Purchase has introduced the GPS vests, which are used by top clubs in this country and overseas. Commenting on the benefits of using the latest technology, Saunders added: "We try and replicate what they do in the Premier League. We haven't got Premier League players but we can make them the best they can be and as fit as they can be.
"We are really just trying to avoid injuries at the moment. Tommy (Lee) is feeling his groin a little bit and Drew Talbot is not quite right yet, but the main thing is that they get through the first couple of weeks' training."
The Spireites boss is pleased with the way the players have responded since he took charge. He said: "The players have taken everything we're trying to do on board. We've just got to try and build on what we did last season. We've got to keep the good bits and try and improve the things we didn't do so well."
Spireites Player subscribers can view the full interview here.