Photos: Tucson woman teaches Krav Maga defense system
Jenna Herder teaches Krav Maga using a gym in converted storage units, Tucson, Ariz.
Jenna Herder

Jenna Herder throws kicks while working with Tim Powell on his defensive moves at her Combat Krav Maga gym, 33273 N Freeway, Wednesday November 15, 2017, Tucson, Ariz.
Jenna Herder

Cindy Ros-Anderson gets a practices getting a hold using Tim Powell as a victim at Jenna Herder 's Combat Krav Maga gym, 33273 N Freeway, Wednesday November 15, 2017, Tucson, Ariz.
Jenna Herder

Jenna Herder catches Tim Powell's fist while demonstrating a defensive technique at her Combat Krav Maga gym, 33273 N Freeway, Wednesday November 15, 2017, Tucson, Ariz.
Jenna Herder

Jenna Herder helps Richard Anderson refine his technique in escaping a neck hold while teaching a class at her Combat Krav Maga gym, 33273 N Freeway, Wednesday November 15, 2017, Tucson, Ariz.
Jenna Herder

Instructor Jenna Herder celebrates as Cindy Ros-Anderson finally finds the right position to get a grip on her husband Richard Anderson and break a neck hold during a class at Herder's Combat Krav Maga gym, 33273 N Freeway, Wednesday November 15, 2017, Tucson, Ariz.
Jenna Herder

Jenna Herder watches her students work on establishing neck holds during a class at her Combat Krav Maga gym, 33273 N Freeway, Wednesday November 15, 2017, Tucson, Ariz.
Jenna Herder

Jenna Herder dances along with student Ben Daniels, practicing a strike, during a class at her Combat Krav Maga gym, 33273 N Freeway, Wednesday November 15, 2017, Tucson, Ariz.
Jenna Herder

Jenna Herder watches Cindy Ros-Anderson deliver an elbow strike at Herder's Combat Krav Maga gym, 33273 N Freeway, Wednesday November 15, 2017, Tucson, Ariz.
Jenna Herder

Jenna Herder gets into in with her students, running a set of "burpees", a jumping squat thrust, during a class at her Combat Krav Maga gym, 33273 N Freeway, Wednesday November 15, 2017, Tucson, Ariz.