I highly recommend Ruby's Tumbling in Alameda for gymnastics. My older child went there since she was almost 2 yrs old. She is 7 and still sometimes takes an older kids class, although it's mostly geared towards younger kids. I also take my 2 yr old daughter and she loves it. There are Saturday classes.
Archived Q&A and Reviews
Re: Low-key tumbling class for 2.5 year old
You should look into Ruby's Tumbling in Alameda. It's perfect for active little kids and they have classes for all ages. Very low key, no competition, just lots of tumbling, climbing, jumping and fun! http://www.rubystumbling.com/classes.html Mom of a Climber
Re: Gymnastics for 4-year-old
Try Ruby's Tumbling in Alameda. It's totally zero-pressure on the kids, but they have a lot of fun and learn a lot. My 3 1/2 year old loves it! http://www.rubystumbling.com/ Mama of a Tumbler