There’s lovely ones at the Penn clinic in Hatfield run by a birthing expert called Jilly
I go to a Yoga / Pilates studio in Dunstable called Balance Fitt (Markyate end) that isn’t pregnancy specific but they modify everything for me and it’s fab!xx
The Yoga Hall on Hatfield Road has lovely pregnancy yoga classes, and mum and baby classes for when baby arrives 😊
https://theyogahall.co.uk/classes/mother-baby/pregnancy-yoga/#/
There’s a gentle pregnant yoga class that takes place at the Jubilee center in St Albans on Thursdays. Kate is AMAZING! It’s less like exercise and more like physical therapy for being pregnant: https://www.beautifulbountifulyoga.com
There’s one at the Salvation Army (opposite slug and lettuce) in St Albans I’m about to start going