How to pick your starting weights (the rule of two)

Most programs hand you percentages of a one-rep max you've never tested, which is a calculation problem disguised as a training instruction. Then you spend workout one doing arithmetic instead of training.
The program uses one rule instead, and it works on every exercise, at every level, forever.
The rule of two
The final two reps of every working set should be genuinely difficult. Not impossible — difficult. If rep ten looks exactly like rep three, the weight is too light. If you're grinding from rep six and your form is coming apart, it's too heavy.
This is a plain-language version of what coaches call reps in reserve: finishing a set with roughly two good reps left in the tank. It's the intensity range where the training effect is strong and the injury risk stays low, which is exactly where you want to live inside a calorie deficit.
Workout one is calibration, not performance
Your first session with any movement has one job: find the number. Start deliberately light, do the prescribed reps, and if the last two were easy, add weight next set. You'll spend two or three sets finding it. That is the session working correctly, not you underperforming.
Write every number down. The log is the program's memory, and next week's instruction is simply 'beat the page'.
- Set one: clearly light. Confirm the movement pattern feels right
- Set two: add weight. Aim for the last two reps to start biting
- Set three: adjust once more. This is usually your working number
- Record load and reps for every exercise before you leave
How fast to add weight
Progression is not a straight line, especially while cutting. Small, frequent increases beat big occasional ones — think the smallest jump the equipment allows, added when you hit the top of the prescribed rep range with two reps still in reserve.
Lower-body lifts tolerate larger jumps than upper-body lifts, simply because the muscles involved are bigger. When you can't add load, add a rep, add a set, slow the lowering phase, or shorten the rest. All of those are progression.
When to leave the weight alone
- Any session where your form degrades before the last two reps
- The first session back after two or more missed days
- Deep in the deficit, when sleep has been short — hold the weight and win the reps instead
- Any movement that produces sharp pain rather than muscular effort. Stop, substitute, and see the recovery guides
“The right weight is the one that makes the last two reps a decision.”
Sources
Written by Coach D — the voice of the certified personal trainers behind the SHRED30 system. Educational content, not medical or dietary advice.
Day 1 is free.
Go deeper: the free anatomy nutrition and strength & conditioning study guides teach the science under every article.


