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| Date | Meet | Equipment | Squat (kg) | Bench (kg) | Deadlift (kg) | Total (kg) | DOTS |
|---|---|---|---|---|---|---|---|
| 2009-07-01 | World Sub-Juniors & Juniors Bench Press Championships | Single-ply | — | 175 | — | — | 105.87 |
| 2010-09-27 | World Sub-Juniors & Juniors Powerlifting Championships | Single-ply | 320 | 200 | 320 | 840 | 496.66 |
| 2012-06-22 | Polish Under 20 & Weteranki Championships & Polish Cup | Single-ply | 315 | 220 | 315 | 850 | 506.96 |
| 2012-08-28 | World Sub-Juniors & Juniors Powerlifting Championships | Single-ply | 335 | — | 322.5 | — | — |
| 2013-04-09 | European Sub-Juniors & Juniors Powerlifting Championships | Single-ply | 335 | 222.5 | 332.5 | 890 | 523.96 |
| 2013-08-27 | World Juniors & Sub-Juniors Championships | Single-ply | 315 | 237.5 | 330 | 882.5 | 515.84 |
| 2013-11-23 | Polish Powerlifting Championships | Single-ply | 355 | 242.5 | 320 | 917.5 | 536.5 |
| 2014-04-09 | European Sub-Juniors & Juniors Championships | Single-ply | 340 | 230 | 335 | 905 | 549.23 |
| 2014-05-21 | Polish Powerlifting Cup | Single-ply | 340 | 230.5 | 350 | 920.5 | 559.98 |
| 2014-09-01 | World Sub-Juniors & Juniors Powerlifting Championships | Single-ply | 345 | 230 | 337.5 | 912.5 | 552.03 |
| 2014-12-06 | Polish Powerlifting Championships | Single-ply | 350.5 | 242.5 | 340 | 933 | 564 |
| 2015-03-14 | Polish Bench Press Championships | Single-ply | — | 240 | — | — | 145.23 |
| 2015-05-06 | European Open Men's Championships | Single-ply | 340 | 235 | 337.5 | 912.5 | 552.16 |
| 2015-11-09 | World Powerlifting Championships | Single-ply | 340 | 230 | 345 | 915 | 553.55 |
| 2015-12-05 | Polish Powerlifting Championships | Single-ply | 310 | 250 | 320 | 880 | 522.82 |
| 2016-03-19 | Polish Classic Powerlifting Championships | Raw | 265 | 165 | 290 | 720 | 435.75 |
| 2016-10-22 | Polish Bench Press Championships | Single-ply | — | 180 | — | — | 105.06 |
Jan Joskowski's career best to date is 933 kg, set in 2014 at age 22. Their total grew 93 kg over 4.2 years between their first meet and that mark (~22.2 kg/year).
Career-best meet: Polish Powerlifting Championships · PZKFiTS
vs Single-ply · 105 kg class · junior · drug-tested