A training log is only useful when the numbers mean the same thing from session to session. Gyms may label equipment in pounds, kilograms, or both, and bars can differ. Take a moment to identify what you are using instead of relying on the appearance of the plates.
Confirm the units
Read labels and ask staff when the bar or machine weight is unclear. Record the unit alongside the number, especially when visiting another facility. If you convert a value for your personal record, keep the original entry too. A unit mix-up can make an ordinary session look like an enormous change in performance.
Use one recording convention
For a barbell movement, be clear whether your entry represents the total loaded weight. For dumbbells, note whether the number is per hand. Keep plate combinations organized and check both sides before lifting. Do not assume that an unusual plate color or a familiar bar shape tells you everything about the equipment.
Compare like with like
A different implement, machine, or setup may deserve a separate record even when the stated weight is identical. Add a brief equipment note rather than forcing every result into the same history. Accurate entries reduce confusion and help the next session begin with a sensible starting point instead of a guess based on an unexplained number.