Work will begin on a £1 million refurbishment on Sportspace Hemel Hempstead next week.
It will start with the extension of the first floor gym into the upper hall but the gym will still be in use.
Improvements will include a functional rig like the one already installed at Longdean School.
The second phase of work involves refurbishment of the swimming pool changing rooms and the sports changing rooms on the ground floor.
They will get new showers, flooring, tiling, changing cubicles, toilets and vanity units.
Operations director Rebecca Hemmant said “We realise that there will be some disruption in the short term, but we are very confident it will be worth it in the end.”