Practice these exercises in the order presented, incorporating one into your living ritual before progressing to the next. The cumulative effect of these exercises done in sequence can bring a depth of olfactory attunement that is harder to reach than when selecting the exercises randomly. Be mindful that your goal is not the completion of these exercises, but the expansion of your sensory awareness. Dig into the ground and smell the earth in a variety of areas. Account for what may be causing the differences in smell.
Odors carry better on moist air, and breath adds moisture.
Then, while your back is turned, have someone set the rag 100 paces or so out in an open grassy field. Be sure to choose a day with a steady moderate breeze. Now walk the downwind perimeter of the field until you pick up the scent. Continue walking until you lose the scent. You now know the boundaries and width of your scent trail.