Drink

Warm lemon water before coffee, not as a ritual or a cleanse, just because it does something slightly useful and costs nothing.

Move

Single-leg balance. Stand on one foot for thirty seconds, switch. Add a slight bend at the knee if you want it to be harder. Your ankles will thank you eventually.

Small Joy

Getting somewhere early and having nothing to do but stand there. The difference between two minutes to spare and ten minutes early is enormous and costs almost nothing.