How to Log Warm-Up Sets: The Data Most Lifters Throw Away

Every warm-up set is a mini-assessment of your readiness for that session. The empty bar tells you about joint mobility and baseline movement quality. The 50% set tells you about neuromuscular activation and general energy. The 70% set tells you about bar speed under moderate load — which correlates strongly with your capacity for heavy work that day. By the time you reach your working weight, the warm-up has already told you whether this is a day to push for a PR, hit the prescribed numbers, or back off.

Most lifters treat warm-ups as mindless reps to get through before the 'real' training starts. They load the bar, crank out a few reps without paying attention, and move on. But the lifter who notices that the bar felt slow at 70% today — when it normally flies — has early information that the working sets might not go as planned. That lifter can make an intelligent decision: reduce the top set weight by 5%, extend rest periods, or add an extra warm-up set to prime the nervous system before committing to heavy loads.

The argument against logging warm-ups is that it clutters the page and takes time. Both objections disappear with the right notation system. You do not need to log warm-ups with the same detail as working sets. A simple shorthand that captures weight, speed, and any flags takes three seconds per set and fits on a single line above your working set data. The information-to-effort ratio is extremely high.

Over time, your warm-up log becomes a readiness database. You can look back and see that every time the 70% set felt slow, your top set also underperformed. Or that on days when the empty bar felt smooth and fast, you hit PRs. These patterns are invisible without data. They become obvious with even a few weeks of warm-up logging.

You do not need full set-by-set detail for warm-ups. You need three things: the weight jumps (how you ramped up), a bar speed indicator for each jump, and a flag if anything felt off. That is it. No RPE, no tempo notation, no elaborate notes. The goal is capturing diagnostic information with zero friction.

Weight jumps matter because they reveal your warm-up strategy, and warm-up strategy affects performance. A lifter who jumps from 135 to 225 to 315 on squats is making 90-lb jumps that leave gaps in nervous system preparation. A lifter who goes 135, 185, 225, 275, 315 is making consistent 40-50 lb jumps that progressively prime the movement pattern. Logging the jumps lets you see whether your warm-up strategy is helping or hurting, and adjust it over time.

Bar speed is the most diagnostic variable in a warm-up set. Use a simple three-letter system: F (fast — the weight moved quickly and easily), N (normal — expected speed for this percentage), S (slow — noticeably slower than usual at this weight). You already have an intuitive sense of how fast 60% or 70% should move. The notation just captures that sense on paper so you can reference it before deciding on your working weight.

Flags are for anything abnormal. A flag might be: 'left hip tight,' 'right shoulder clicked on rep 3,' 'balance shifted forward,' or 'grip felt weak.' These are not injuries — they are movement quality observations that might affect exercise selection or loading for the rest of the session. One or two words is enough. If the warm-up set felt perfectly normal, no flag is needed. Only note exceptions.

Here is the shorthand system that fits an entire warm-up sequence on a single line in your logbook. For each warm-up set, write the weight followed by the speed letter in parentheses. If there is a flag, add a short code after the speed letter. Chain all warm-up sets together with forward slashes.

Example for a squat session: 'WU: 45(F) / 135(F) / 185(F) / 225(N) / 275(N).' This tells you at a glance that the bar through 185 all moved fast, and 225-275 moved at expected speed. Everything was normal. Now here is what a concerning warm-up looks like: 'WU: 45(F) / 135(N) / 185(N) / 225(S) / 275(S-hip).' The 135 already felt merely normal instead of fast, speed degraded at 225, and by 275 the bar was slow with a hip flag. That warm-up sequence is screaming at you to adjust the session.

For your logbook layout, dedicate a single line above each main exercise's working sets to warm-up notation. Label it 'WU:' and write the chain. It takes up minimal space — one line compared to the 4-6 lines your working sets will occupy — but the information density is high. When you flip back through your logbook during a review, the warm-up line gives you instant context for the working set performance that follows.

If you are using ForgeLogbooks, include a dedicated warm-up row at the top of each exercise block in your template. Pre-label it 'WU:' with enough horizontal space for 4-6 entries. This structural reminder ensures you actually log the warm-ups instead of skipping them — the row is staring at you, waiting to be filled. Built-in prompts beat willpower every time.

The whole point of logging warm-ups is to make better decisions about the working sets. Here are the specific warm-up signals that should change your plan and what to do about each one.

Signal one: bar speed drops earlier than expected. If 70% feels slow when it normally feels fast, your nervous system is not firing at full capacity today. Reduce your top working set by 5% and add one extra rep to maintain volume. Do not try to push through — a slow warm-up almost always means a missed rep or ugly technique on the top set.

Signal two: movement quality flags on multiple warm-up sets. If your left hip felt tight at 135 and still feels tight at 225, it is not going away by 315. Swap to a variation that reduces the demand on that joint — front squats instead of back squats, trap bar instead of conventional deadlift — or spend an extra 5 minutes on targeted mobility before continuing. Logging the flag gives you documentation that helps identify recurring patterns across weeks.

Signal three: warm-ups feel unusually fast and light. This is the good version. When 70-80% moves like 50% normally does, you are primed for a strong session. Consider adding 5 lbs to your planned top set or pushing for an extra rep on your AMRAP. Great warm-ups are as informative as bad ones — they tell you today is the day to capitalize. But you will only notice this pattern if you have logged enough normal warm-ups to establish what 'usual' feels like.

The discipline of adjusting sessions based on warm-up data separates intelligent training from ego-driven training. Your logbook captures the warm-up signal. Your brain interprets it. And the working sets reflect a decision, not a guess.