Here are a few examples of high school mathematics teachers who have made small changes to their practice which have been positive for both the teachers and their students.I highly recommend exploring other posts on these blogs.
On exit slips as practice (and giving less homework)
On using individual whiteboards (for individual work and group work)
On using large whiteboards: (to increase the amount of collaborative learning)
Aside: an old post of mine on sourcing large whiteboards in BC
Bonus blog posts:
On showing your working in math Is Your Own Math Work Shareable?
Changing Perspectives in Math by West Van HS Math teacher (10 min video, slides)
Renovating My Classroom 
Thanks for this because it has been helpful for an English-socials guy to have a place to go to when I need a math or science context for my student teachers. Really appreciate how you direct us to different thinkers who are working on similar paths.
David: Thanks for the encouragement. Still working on finding the time share out. My current role, much like yours, changes your audience. In some ways I feel like my current “story” isn’t relevant to colleagues so my posts tend to be other people’s stories. Part of of me is really looking forward to having a classroom of my own so I can do some “hands on renovating” — feel like I am more of a contractor than a DIYer:)