Setting intensity, running pace, interval training and why recovery is part of the plan.
Training effect comes from the combination of intensity, duration and frequency. If intensity is hard to judge, the talk test is practical: comfortable full sentences means easy, short sentences means moderate, a few words at most means hard. Heart-rate zones are widely used too, but individual variation and measurement error make them best treated as a guide.
Pace is minutes per kilometre. Knowing it lets you work backwards from a goal finish time, which turns a vague plan into a concrete one. A common mistake is running everything at moderate effort; keeping most easy and reserving a small share for hard work is the widely accepted approach for both recovery and progression.
Intervals alternate hard efforts with recovery. They deliver strong cardiovascular stimulus per minute spent, but they also demand more recovery. Warm up properly and avoid stacking hard sessions back to back.
Adaptation happens during recovery, not during the session. Insufficient sleep combined with high volume reduces performance and raises injury risk. Scheduling rest days first and filling the rest around them is an effective guard against overtraining.
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