The only time I was in the fitness center at the YC/BC was to walk through it to get to the lockers on our last day. We stored out bathing suits and a change of clothes there for an afternoon swim in SAB after the parks.
This is what I found:
Fitness Center and Spa
The Ship Shape Health Club is located between Disney's Yacht Club Resort and its sister, Disney's Beach Club Resort.
This fitness center and spa features massage therapies, body treatments, skin care and hair services, and men's and women's sauna and steam rooms.
State-of-the-art fitness equipment by Life Fitness and Hammer Strength includes treadmills, elypticals, stair climbers, regular and recumbent bicycles, weight machines and free weights.
Open 24 hours a day.
An attendant is present from 6:00 a.m. to 9:00 p.m.
For club access beyond attendant hours, meet with an attendant to sign a waiver and obtain a 24-hour access key.
Resort Guests must be 14 years of age or older to use the health-club facilities. Guests 14 to 17 years of age must be accompanied by a parent or a guardian.
A personal trainer is also available by appointment, for an additional cost.
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Found this bit of info:
If you are not staying at one of these resorts and would like to use a workout center, you may do so by paying $12.00 a day (subject to availability.) Please note that if you schedule a spa treatment, you may use the fitness center that day for no additional charge.
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Also found some pictures:
even more pictures:
http://allears.net/acc/bc28.jpg
http://allears.net/acc/bc29.jpg
http://allears.net/acc/bc30.jpg