A block is an arc, not a stack
Six or eight or ten lessons sold as a block are easy to think of as the same lesson repeated. The clients who renew tend to be the ones whose coach treated the block as a shape, with a beginning, a middle and an end.
A block of sessions is the smallest unit of coaching where progress actually becomes visible to the client. A single lesson can be exhilarating or flat; a block is long enough to feel like something has changed, and short enough to remember as one piece of work. The coach’s job, across the block, is to make that change visible without pointing at it too often.
The structure does not need to be elaborate. Three phases, named privately by the coach and rarely out loud to the client, are usually enough: an opening that establishes the ground, a middle that does the deepest work, and a close that consolidates and points forward.