With more than 1,000 members already signed up, The Gym Group said it will be 'breathing a breath of fresh air' into the health and fitness facilities that Chichester has to offer.
The 24-hour gm, which is replacing the old Lidl supermarket at Portfield Way, has created 16 new jobs.
"One of the fastest growing gym chains in the UK has finally arrived in Chichester," a spokesman for the national chain said.
"We offer over 14k square feet of gym space with top of the range cardiovascular, free weights and functional equipment. If that’s not enough, we also offer a range free gym classes that cater for all.
"The little things make a big difference, so with ample free parking and free WiFi, you’re taken care of."
The Gym Group said it boasts a team of 'highly skilled and experienced' personal trainers who will be 'on hand to help you achieve your fitness goals'.
In August, Oliver Tester, head of property acquisitions, said a ‘flexible and affordable’ gym will bring ‘no contact health and fitness to the city’. Read more hereThe Gym Group already has 180 sites across the UK, including branches in Sussex — Crawley, Horsham, Worthing, Brighton, Hove and Eastbourne.