I try so hard to keep things fun and refreshing so we dont ever feel like we need "reenergized", we will sit outside in the grass on warm sunny days for class discussions.I like to move seats around a lot, sometimes in a circle or a square, we do a lot of "ice breakers" when we are feeling sluggish, but it still happens occasionally. When it does I ask my class for ideas to "spruce" things up a bit and I always use one of their ideas. It really makes them feel good to give input on how our classes are conducted!