Ginny MacColl, who was diagnosed with osteopenia in her 40s, says women are never too old to build muscle. Here’s how she ...

Ginny MacColl, 73, got fit in her 60s and now competes in American Ninja Warrior. She started by aiming to do one pull-up.

Ninja, popularized by the hit television series American Ninja Warrior ... A combination ninja warrior and parkour gym, Ninja Fit helps build stamina, flexibility, and self-assurance.