Columns are tall and skinny. The example above shows completing 1 boulder problem at every grade from V0-V10. Although this plan is simple, it is a dubious method to accomplish training goals. Rarely does the action of completing a column match any goal, other than to complete the column itself. Inherently, the intensity will either be too low or too high.
This is a follow up to the Pyramids, Diamonds, and Hourglasses post.
There are two additional shapes to structure training - Columns & Rows.
Rows are short and fat. The above example shows completing 8 problems at V5. It is easier to modulate volume and intensity in row format than column format, increasing the likelihood of eliciting a positive training effect. Continuous Intensity Repetitions (CIR) training is built upon the row idea.