More big news for local fitness fashionistas: Fabletics, the activewear chain founded by actress Kate Hudson, is heading to Westfield Montgomery mall. Doors will open this spring next door to Apple, directly above the Aerie store that’s also on the way. The two popular retailers are joining a lineup that already includes Lululemon, Under Armour and the growing activewear departments at Old Navy, Macy’s and Nordstrom. In other words: Westfield Montgomery is about to become the best place in MoCo to shop for women’s workout clothes. Which will be especially convenient if the mall ever moves forward with pre-pandemic plans for a new Life Time Athletic club.