What does it mean that exploit the bottleneck first?

Before adding capacity make sure the bottleneck is fully utilized.

Example: You are a software engineer whose bottleneck is focused coding time — you measured it in L-0945 at 2.3 hours of deep work per day against a need for 4. Your instinct is to wake up an hour earlier or negotiate a remote-work day. Both are elevation strategies that cost something. Before you invest, you audit how you actually use your existing 2.3 hours. You discover that you spend the first 18 minutes of each coding block reopening files, re-reading where you left off, and rebuilding mental context because you close everything at the end of each session. You lose another 14 minutes to Slack notifications you forgot to mute. And you burn 22 minutes per session deciding which task to start, because you arrive at your coding block without a predetermined target. That is 54 minutes of waste inside a 138-minute constraint — 39% of your bottleneck is not producing code. You write a shutdown checklist that leaves your IDE state intact with a sticky note naming tomorrow's first task. You mute Slack on a schedule. You pre-select your coding target during your daily planning review. Your effective deep work jumps from 2.3 hours to 3.5 hours without adding a single minute to your day. You exploited the constraint before expanding it, and you got more improvement for free than the early alarm would have bought you.

Try this: Take the bottleneck you measured in L-0945 — the constraint with a baseline number attached to it. Conduct a waste audit. For the next three working days, every time you are actively engaged with your constraint (your deep work block, your decision-making window, your creative session, whatever the bottleneck is), log every interruption, every piece of unproductive time, and every moment where the constraint is idle or degraded. At the end of three days, categorize the waste: setup time, interruptions, lack of prepared inputs, decision overhead, environmental friction. Calculate the total waste as a percentage of your constraint's available time. Then choose the single largest waste category and design one intervention — not an investment, not a new tool, not extra hours — that eliminates or reduces that waste within your existing schedule. Implement it for one week and re-measure. The gap between your old baseline and your new number is pure exploitation gain.