Mile High Karate Thornton
Martial arts & karate classes in Thornton, Colorado
Kids, teen, adult and family martial arts at 3979 E 120th Avenue. Led by Amanda and Stephen Christensen since 2003, part of Mile High Karate since 1983.
Thornton, CO 80233(303) 280-1839Since 1983
A Black Belt school in Thornton
Mile High Karate Thornton teaches martial arts to children, teens, adults and families at 3979 E 120th Avenue in Thornton, Colorado. Owned and operated by Amanda and Stephen Christensen, who have taught with Mile High Karate in the Thornton and Westminster area since 2003, the school is part of the Mile High Karate organization founded in Colorado by Grand Master Stephen Oliver in 1983. Call (303) 280-1839.
| School | Mile High Karate Thornton |
|---|---|
| Address | 3979 E 120th Ave, Thornton, CO 80233 (map and directions) |
| Phone | (303) 280-1839 |
| Serving | Thornton, Northglenn, Brighton, Westminster and the north Denver metro |
| Owners | Amanda and Stephen Christensen |
| Ages | Preschool, 4–6, 7–12, teens and adults; family classes |
| Hours | 9 am–9 pm, seven days a week |
| Class times | Monday–Friday 3–9 pm; Saturday 9 am–3 pm |
| Schedule and enrollment | ThorntonMHK.com, the Thornton school’s own site, has the current class schedule, online special and enrollment |
Classes for every age

Kids karate, ages 4–6 and 7–12
Character lessons in every class and the Black Belt as each child’s long-term goal.

Preschool martial arts
Short, active classes that build listening, coordination and focus.

Teen martial arts
Fitness, self-defense and leadership for teenagers.

Adult martial arts and self-defense
Conditioning and practical self-defense for any starting fitness level.

Family classes
Parents and children can train together, and many Mile High Karate families do.

Bully prevention
How to recognize, avoid and respond to bullying, with confidence first and physical skills last.

Before- and after-school programs
Enrichment in the Jefferson, Adams and Brighton school districts, with funds raised returned to the schools.
Why families choose Mile High Karate Thornton
- 43 years in Colorado. Mile High Karate has taught Colorado families since August 6, 1983.
- More than 20 years in Thornton. The Christensens have led Mile High Karate in the Thornton/Westminster area since 2003.
- A Black Belt school. Mile High Karate has promoted more than 1,000 Black Belts, ages 5 to 76; in Thornton, well over 30% of active students are Black Belts.
- A real lineage. Founded by 10th Degree Black Belt Grand Master Stephen Oliver, with Grand Master Jeff Smith as Chief of Instruction, in the line of Grand Master Jhoon Rhee.
- Tournaments and retreats. Well over 120 intramural tournaments hosted, and Black Belt testing finishes at a three-day retreat in Breckenridge, Colorado.
- Part of local schools. Before- and after-school enrichment programs in the Jefferson, Adams and Brighton school districts.

Meet the Christensens
Amanda and Stephen Christensen have provided martial arts instruction for families with Mile High Karate in the Thornton/Westminster area since 2003, shortly after they began training alongside their two daughters. They own and operate Mile High Karate Thornton, which is independently owned and operated by Tasak LLC as a Mile High Karate franchise.
For more than 20 years they have worked with the local community, supporting schools and raising funds every year through before- and after-school enrichment programs in the Jefferson, Adams and Brighton school districts. See school programs.
Alexandria Christensen, 4th Degree Black Belt, is head instructor in Thornton. She began teaching the school’s youngest students at age 14, served six years in the Colorado Army National Guard and worked four years as a registered behavioral therapist for children with autism.
Meet the full Thornton instructor team on ThorntonMHK.com.
What Thornton families say
The best decision we made for our sons. Consistent character, leadership and personal development. Sustained athletic and intellectual growth. Owners and adult leaders who genuinely care about your kid.Elizabeth Galentine · Parent, Thornton · Google review
Family run, with that unique old school touch that makes you feel welcome and at home. … They’ve been able to learn structure and discipline in a fun way. … Thank you Mile High Karate in Thornton for all you do for the community.Julian Romero · Parent, Thornton · Google review
I was a student at MHK when I was a kid and the life lessons I learned stuck with me as I got older. When I became a parent, I wanted my son to have those same life lessons. … I am 45 and still training, I like to try to keep up with the kids!Mindy Davis · Parent and former student, Thornton · Google review
Quoted as written, shortened where marked. Read more than 300 reviews and stories.
Your first class
New students start with an introductory lesson so the instructor can meet the student, explain the program and set a first goal. Wear comfortable exercise clothes and bring water; no experience or special fitness is needed. Two classes a week is the standard recommendation. See the new student guide.
Answers to the questions parents ask most — the best age to start, how often to train, how long a Black Belt takes — are on the Mile High Karate Thornton parent FAQ.
About Mile High Karate
Mile High Karate was founded in Lakewood, Colorado, in 1983 and grew to five schools in 18 months. Read the history of Mile High Karate, meet founder Grand Master Stephen Oliver, or see Mile High Karate by the numbers.
Book a first class
3979 E 120th Ave, Thornton, CO 80233
(303) 280-1839Hours: 9 am–9 pm, seven days a week. Classes: Monday–Friday 3–9 pm, Saturday 9 am–3 pm.
© Mile High Karate, LLC and Stephen Oliver – All Rights Reserved. Mile High Karate® is owned by Mile High Karate, LLC, Stephen Oliver – Founder, CEO.