In no particular order:
Lululemon athletica: Always ahead of the trends. Never leave the store empty-handed. High-quality, huge selection. A one-stop-shop.
Lorna Jane: Hands down my favorite sports bras. Also excel in high-waisted pants.
Lily Lotus: Support local! Super comfy soft fabrics - organic cotton and bamboo - hypoallergenic and healthy!
Liquido Active: Make my new favorite pants for Pilates. Almost seamless. I could wear them everyday. You feel naked (in a good way). 15 new fabrics per month! Bold colorful patterns. NOW AVAILABLE FOR PURCHASE @ THE STUDIO!!
Zella: Find it at Nordstrom. Similar to Lululemon at a lower price.