I exercised regularly before lockdown 1, and worked through, albeit WFH (which is set to continue for the foreseeable...). It helped that the weather was so good during Lockdown 1, and the days were getting longer, so I walked a lot. It was also a good way of being able to see friends. I did about 5 weeks of daily PE with Joe, which was a great way to start the day. My health insurance also offered free access to the Peloton app, so I signed up to that, and I've enjoyed it so much. We already had a spinning bike (and a treadmill) in the garage, so I've not had to invest anything. Over the summer, DH and I did C25k with DS13 (DH runs regularly, and I dabble), although having completed the programme, the change in weather, going back to school, and dark evenings has put a bit of a dampener on the running.
In the past, I've also had great use from Fitness Blender, the 30 day shred. Plus I'm a member of Move GB, which gives access to loads of fitness classes all over the country - useful now it's all on Zoom! I attend yoga using this membership, both in person (when we could), and on Zoom.