Info and Frequently Asked Questions

History of JJGym
Jeri Habberstad (professional stuntwoman and circus artist) and Jack Kalvan (professional juggler/entertainer) dreamed of having their very own home training space. In January, 2007, after a year of construction, the gym was completed. Shortly thereafter, people began showing up on their doorstep looking for a place to train. Jack and Jeri have welcomed the circus and stunt community into their space.

Reserving space / How do I get a password?
The JJGym calendar is at
The first time you come, just check the schedule and come in when it looks like there is space available.
Fill out a waiver when you get here. On it is a space to specify your password to make future reservation. (Allow a couple of days before using it.)
Once you have a password, you can enter it in the upper right corner in the login box. You can reserve gym space in 25% increments, depending on the amount of space you will need.
Please always respect the schedule. If the gym is reserved at 100% capacity, find a different time to come in.
Hours of Operation: 7 AM to midnight. If you wish to use the gym after midnight please contact Jeri.
Cancellations: Please cancel your gym reservations asap if you are not going to be here.

How much does it cost?
Open practice: Payment is by donation. We suggest $5 per person.
If you are short on cash (or just want to be helpful) there are other ways to express your appreciation: vacuuming, bathroom cleaning, window washing, babysitting, etc.
To reserve 100% of the gym for a private session let Jeri know and we will work out a rate. If you've previously discussed it with us, you may book the space and then promptly notify Jeri of the date and time.
If you reserved the space and didn't show up, please consider donating extra on your next visit.

For first time visitors:
JJGym is attached to the back of our home on a normal neighborhood street and is somewhat hidden from the front. Go around the left side of the house to the back.
PARKING: Street parking is usually easy. Be careful not to block any driveways or walkways or you may be towed.
Guest Book: We like to have all visitors sign our guest book every time you visit.

Do you have aerial apparatus or do I need to bring my own?
There are usually a few silks here to use but we prefer you bring your own apparatus, including carabiners, etc.
We have 6 hanging points with swivels, that can be lowered with pulleys, so they're easy to attach to and raise to your desired height.
There are also exposed trusses and an extension ladder if you'd like to climb up and rig something different.
Please DO NOT use the trampoline or other circus equipment without prior permission from Jack or Jeri.

Do you have classes?
Yes! To join one of the classes on the schedule, please contact the instructor (info should be on the calendar).
If you would like to teach a class, we can arrange that too. Please contact Jeri.

Jeri Kalvan -, 661-713-3141
Jack Kalvan -, 310-489-1849

Customized Circus Apparatus Fabricator and Expert Rigger
Brett Copes, 818-422-2300

Kids Stunt and Circus Camps and Children's Gymnastics Classes
Jeri Kalvan,, 661-713-3141

Rhythmic and Traditional Gymnastics, Trampoline, and Contortion Training
Ben Ellis, 904-713-7358

Freerunning Classes and Privates
Nic Walton, 530-520-1396

Aerial Circus Instruction
Sarah Romanowsky,
Jena Carpenter, 818-653-5629 (also teaches contortion and hand balancing)
Kerry Wee, 818-255-8699
Focus Fish Homeschool and Kids Classes; Kristy 323-691-5747,

Personal Training, Capoeira Instruction
Danilo Lambo, 407-701-3721

Adult Acrobatics Meet Up: See Facebook Group JJGym Acro Meet Up

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Kalvan Links Page