Some questions for Marnie and the fam!

Hi all, I'm looking for some wisdom! When I started M/Body in the fall, I first fell in love with the cardio-focused/sweat classes, especially those with jumps and other ways to focus on bone density. It's the first time I've felt really comfortable with doing more impact and it felt so good. In the last couple months, I've started having the tiniest of right knee pain at very specific moments, mostly going down stairs or doing lunges with my right knee at the back or all the weight on my right knee like in side lunges. It's so slight it's not even "pain" so much as a little twinge for one moment, but it's definitely not the good kind of ache. So I've really eased off the impact and the cardio, and that's been tough for me after seeing so much mental growth since the fall. I've never had knee stuff before! On the plus side, I've fallen in love with barre-focused and arm-focused classes, and that has been amazing. So I have a couple questions:

1) For Marnie and the M/Body team: Do you have any recommendations for me with this knee thing? It doesn't bother me at all to go for long walks or do wide seconds; it's really back and side lunges. I've been wearing a knee brace and that helps a lot, but I still am very cautious about messing it up.

2) For Marnie and the M/Body team: Do you have classes you recommend for bone density focus while I'm being cautious about impact? I still want to prioritize this!

3) For the global fam: I'm going to be traveling a bunch this summer and would love your recommendations for classes with minimal lunges and impact that are mostly standing! Until now, dancer's legs and cardio dance classes have been my go-tos for travel but that doesn't seem like the best option for me right now.

Thank you all!