Peloton instructor Leanne Hainsby has hosted her first cycling class since revealing she's been privately battling breast cancer.The fitness star, 35, was diagnosed in August after finding a lump in her breast and has since undergone one surgery and 12 weeks of chemotherapy. Taking to Instagram on Wednesday, Hainsby thanked her followers and devout Peloton members for their support.'FIRST CLASS BACK @onepeloton,' began Hainsby, who included a slideshow of snaps from the day's livestream.'I felt the love today. Honestly, I felt really apprehensive ahead of todays ride.' Welcome back! Peloton instructor Leanne Hainsby has hosted her first cycling class since revealing she's been privately battling breast cancerShe continued: 'It's a big platform and I've allowed myself to be vulnerable with you all, and today felt a bit like my first day at school, and that's all a lot for so many reasons, but you know what, this was a milestone that felt so far away at one point, and here I am on the other side of it.'F**k yeah! Your kindness, and your support is beyond anything I could've imagined, and to have over 8.5k of you joining LIVE, and showing each other love in the moment is what it's all about,' she wrote.'On the bike, it'll always be about YOU, and I'm so happy we got to sparkle together today!'Her fiance and fellow Peloton instructor Ben Alldis was there in support of her big return.