At Bayland Park in southwest Houston, baseball diamonds can be found everywhere.

However, it is inside the community center, where one special gem is helping people discover the benefits of staying active at any age.

Meet Annette Kapp, a 90-year-old fitness instructor whose energy, enthusiasm and dedication have made her a favorite among students who fill her free exercise classes each week, "She's amazing. Who would think that she is 90 years old?" said Laurie Bricker, one of Kapp's students.