I mainly use the GC Residents Shuttle bus to get to work - 30-40 mins from Phase 2 to Central (outside post office) + 5 mins to Wan Chai (Central Plaza). 5 buses each morning (7, 7:30, 7:50, 8:05, 8:20, 9:35) and similar back in the evening (between 5:45 and 8pm). when there is no shuttle bus, 962 takes 45-60mins (45 offpeak; 60+ in peak but peak is when the shuttle buses run). there is also the 962B (5 mins slower, goes via Sham Tseng only to Admiralty) and red minibuses to Jordan and Mongkok (slow inbound, very fast back to GC when they fill up and dash non-stop to Sham Tseng then GC in 30mins total).
Gyms - Phase 2 has a good gym/tennis courts/squash courts and a pool. Gold Coast Yacht and Country club has a good (small, no classes) gym but membership is awfully expensive. There is a California and a Physical in Tuen Mun - 10 mins on the bus from GC.