Jill Oxford


Ms. Jill, or “Mama Jill”, as some call her, began her involvement with gymnastics through her 3 kids (Cody, Jacque, Jenny). She and David opened the doors of Powerhouse TNT Gymnastics together in 2005 while her children were still competing. She currently works in the gym as a TNT team coach, managing staff and the office, and whatever else needs her attention. Jill has been involved in gymnastics as a parent, coach, and judge for 12 years, and still manages to find time to pursue her favorite hobby, traveling.

Teaching Degree w/ Dance Minor(Teacher for 10 years)
Level 1 coaches course
National Judge for TNT: 10 years
First Aid & CPR, USAG Safety Certified, & U100 Course

David Brambila


Coach David has been involved in gymnastics for the better part of half a century!!! He has coach men’s artistic, women’s artistic, and TNT throughout his many years in the sport. The best story I ever heard him tell was about the time he watched a coach get bitten on the butt by a camel at the famous Bela Karoli’s ranch. He has coached all levels of gymnastics, including international elite competitors and national team members.  In addition to being a fearless leader, he is also the Head Coach and Director of TNT Teams.

Former gymnast that could hold 3 types of crosses
Plays a mean guitar
Has a better double tuck on trampoline than most level 10 gymnasts

Front Office

Fran Wehman

Office Manager

Jo Ann Chapa

Front Office

Andrea Trocino

Front Office

Amanda Martinez

Front Office

Program Directors

Jennifer “Jay” Greer

Programs: Class Director & Public Relations Rep.

Years Coaching: 2005-2010, 2012-present (7 years)

Relevant Experience/Certifications:
USAG Member
CPR & First Aid Certified
USAG Safety & Risk Management Certified
USAG Instructor Certified
KAT Certified (Kinder Accreditation for Teachers)
MELPD (Movement Education and Lesson Plan Development)
GAT (Gymnastics Association of Texas) 5 years

Types of classes you coach at Powerhouse:
18 months – 5 year old: All Gym,
Beg. – Int. Girls Artistic & TnT classes
Beg./Int. TnT 6 & up
Mother’s Day Out instructor

Interesting fact about you:
I enjoy playing sand volleyball & softball, zumba, and puzzles. My daughter is on the Girls Artistic Team. I have an extended family (4 kids). I’ve worked with children ages 1 & up for a total of 13 years.

Rachel Martinez

Programs: Mother's Day Out, Motion Fitness, Summer Gymnastics Days

Programs: Mother’s Day Out, Motion Fitness, Summer Gymnastics Days

Years at Powerhouse: 6

Relevant Experience/Certifications:
USAG Professional Member
GAT Certified
CPR/First Aid Certified
Lots of looooove for the kiddos

Types of classes you teach at Powerhouse:
Motion Fitness, Summer Gymnastics Days, and MDO

Interesting fact about you:
Rachel has been married to a Bexar County Sherriff Deputy for the past 16yrs.
They have 2 wonderful children. Their son is a sophomore at Brennan High School,
and their daughter is a 6th grader at Bernal Middle. She loves spending time
with her family at the coast, amusements parks, and the riverwalk. Rachel loves
coffee, the Brennan Bears, the Spurs, and Houston Texans Football!!!
She is also a member of Alamo City Lx and loves driving her Dodge Charger.

Ryan Maskell

Programs: Boys Artistic

Years Coaching: 17

Relevant Experience/Certifications:
USAG ProMember
USAG Safety & Risk Management Certified
CPR & First Aid Certified
2001, 2002 Men’s Judge with National rating
1999 NHSGCA “Team Texas” National Champions
2010 NAIGC Board of Directors
2009-2011 Texas Gymnastics Conference Vice-President
Many USAG courses and workshops over the years

Types of classes you at Powerhouse:
Boys Teams

Interesting fact about you:
Ryan’s current goal is to bring high school gymnastics to San Antonio. Enjoys singing from choral music to karaoke.
Founded the Communications Club while studying at Texas State
Used to manage bands and skateboarders.
Loves frito pies and the Houston Texans!!!

About Us


From Competitive Boys and Girls Gymnastics, and Tumbling & Trampoline programs, to Mother's Day Out and Motion Fitness Programs we are here for you! Our professional staff and coaches are eager to see young people succeed. We also host Birthdays, Team Building events, and have space for multiple uses. We look forward to your visit!

Contact Info

Phone: 210-767-9654
Fax: 210-767-9148
7707 West 1604 N
San Antonio, TX 78254

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