Synergi Fitness in Central Bristol | Facilities, hours &... Synergi Fitness is a gym in Central Bristol, offering gym and fitness facilities, strength and cardio training, membership enquiries. Address: Floating Harbour, Welsh Back, Bristol BS1 4SBOfficial website Things to do today Things to do tomorrow This weekend Free events Family events Kids activities in Bristol Live music in Bristol Live sports in Bristol Cinemas in Bristol Gyms in Bristol All Bristol events