A dojo focuses on martial arts, not general fitness exercises like a gym would. He corrected me when I called his dojo just a gym; it's for karate practice.
Pro Tip 2/3
Respectful Atmosphere
Dojos often require a respectful behavior, honoring martial arts traditions. Bow when entering and leaving the dojo as a sign of respect.
Pro Tip 3/3
Hierarchy Present
In a dojo, there can be a clear student and teacher hierarchy; seniors are respected. Address the instructor as 'Sensei' inside the dojo.