In our experience, nothing hurts on the day you add too much, which is what makes it so easy to do. The warm up weight felt easy, so you put 10 kilos on. The workout says 100 reps and you take every one at full speed because stopping feels like losing.
Below is the difference between practising a movement and loading it, why light is the right place to start and the wrong place to stay, and the rules we use to add load and volume.
Practicing and loading are different jobs
Practicing teaches the movement. Loading builds the tissue. Early on, the first job matters more, because the injury research on beginners keeps pointing to technical skill and how people manage their own load.
You learn to drive in a car park before you take the freeway. Same idea. Start at a weight you control, where every rep looks like the one before it. We call that light, and it has no fixed number. Light is whatever weight lets rep one and the last rep look the same. For a brand new lifter that can be an empty bar or a single light dumbbell, and that is a perfectly good session.
When a workout calls for something you can't do yet, scale it and keep the point of the movement. If a box jump is there for explosive power, swap it for a broad jump or a squat jump. A slow step up loses the point.
Light is a start, not a destination
Light loads teach the movement. They are not enough on their own to change your tendons. A meta-analysis of 27 studies found tendon stiffness changed with loads above about 70% of maximum (effect size 0.90) and barely moved with lighter ones (0.04).
Muscle is more forgiving. A meta-analysis of low versus high load training found lighter loads taken close to failure can build muscle, while heavier loads came out ahead for building strength.
So progression is the plan, not a bonus. If an injury has made you nervous, starting light is smart. Staying light because you're scared keeps you safe today and leaves you prepared for the day life asks for more.
Volume counts as much as weight
Weight is only one dial. Reps, sets and training days are the others, aka Volume, and people rush those without noticing.
In a six-month study of CrossFit athletes, the injured group trained more hours a week than the uninjured group (7.3 versus 4.9) and showed up for more sessions (6.4 versus 4.7). That is an association and not proof of cause. It still fits what we see, that beginners who go from a couple of sessions a week to five in a hurry tend to find their weak spot.
Look at your week, not only today's session. Heavy squats on Monday, heavy squats on Tuesday and a long run on Wednesday all land on the same legs. Each session might look fine on its own while the week adds up to a spike.
Why PRs can wait
A PR tests the result of work you've already done. Chasing one early skips the work. Chasing one inside a workout when you're tired adds a max effort to fatigue and sloppy technique, which is a poor combination for anyone.
Test a PR when the movement is well practiced, you're fresh and nothing is niggling.
What progressing looks like
Say you're goblet squatting three sets of eight with a light dumbbell. Every rep looks the same, and the next session feels the same too. That's your checkpoint. Add one rep to each set, or move to the next dumbbell, but not both. If the last few reps wobble at the new load, repeat the session until they don't. Repeating a session is part of the plan and costs you nothing.
Signs you've gone too fast
Technique changes, so the knees drift in or the back rounds. The bar slows down on reps that used to be quick. Something hurts in a way that changes how you move. A niggle is still there the next day, or it turns up earlier in each session. Any of those means drop back a step, and if it sticks around, get it assessed by a physio or exercise physiologist.
Rules for adding load and volume
Hold the same weight, the same reps and the same quality before you add anything.
Change one thing at a time, either load, or volume, or intensity.
Take small steps. A small step is the smallest plate on the rack, or one extra rep. When you're unsure, take the smaller one.
A rep that slows down or changes shape ends the set
Test PRs fresh
Count the week, not just the session.
Progress by checkpoint, not by calendar. When technique holds at today's load and the week feels steady, move on. When it doesn't, stay where you are until it does.
Nobody can hand you a schedule for this, because bodies adapt at their own speed. What you can do is let each step prove itself before you take the next one.
Our Next Part of the Series Part 3 covers why training is built in a deliberate order, and what each type of training asks of your body.
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References
Common Injuries Across Baseline, 6-Month, and 12-Month Assessments in CrossFit Athletes of Different Experience Levels, Sports (2026).
Human tendon adaptation in response to mechanical loading: a systematic review and meta-analysis of exercise intervention studies on healthy adults, Sports Medicine Open (2015).
Schoenfeld, B. J., et al. Strength and Hypertrophy Adaptations Between Low- vs. High-Load Resistance Training: A Systematic Review and Meta-analysis, Journal of Strength and Conditioning Research (2017).
Retrospective Injury Epidemiology and Risk Factors for Injury in CrossFit, Journal of Sports Science and Medicine (2017).
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