Old toothbrushes are great for cleaning minuscule little crevices. I use one dipped in jewellery cleaner to scrub my rings.
When drinking soft drink, fruit juice, cordial, or indeed any drink other than water, use a drinking straw so that the liquid goes straight down the back of your throat instead of washing around your teeth.
When you're hanging out the washing, if you have a Hills Hoist, or any height-adjustable clothesline, wind it up to a level where you have to stand on your toes and stretch to reach it.
Every single time you brush your teeth brush them as though you're about to attend a dental appointment.
When I'm drying the dishes, I dry things one at a time then carry them one at a time to the other end of the kitchen and put them away in the cupboard one at a time. In the bad old fat days I'd dry them all, stack them up, then make one trip to the cupboard carrying the stack..