Training load is the total stress your training places on your body, usually estimated as volume times intensity over a period of time. Lift 100 pounds for 30 total reps and your load for that session is 3,000 pounds. Add up a week of sessions and you get weekly load. It's the number that tells you how much work you're actually asking your body to absorb.
Why it matters
Bodies adapt to gradual increases and break under sudden ones. Most overuse injuries trace back to a spike: someone doubles their running mileage in a week, or jumps from two sessions to five because motivation showed up. Sports scientists watch the ratio between this week's load and the past month's average, and when that ratio climbs too fast, injury risk climbs with it. So the useful question is never "am I training hard?" It's "am I training harder than my body has prepared for?"
How to use it in training
Track something. Sets times reps times weight works for lifting. Weekly minutes or miles works for cardio. Perfect precision doesn't matter, consistency does.
Then keep the ramp gradual. A rough guide: increase weekly load by around 5 to 10 percent, not 50. After a layoff, restart below where you left off and rebuild over two to three weeks. And when life piles on stress from other directions (bad sleep, work chaos, illness), treat that as load too. Your tissues don't care where the stress came from.
Related terms
Go deeper
Want the research on what happens when load outruns recovery? Read our full breakdown: Overtraining syndrome research.