swimJonah Nathanson
Personal records
| Event | Course | Best | Cut | Date | Meet |
|---|---|---|---|---|---|
| 25 Freestyle | SCY | 11.55 | 2025-01-05 | 2025 NE CRIM Jan Team Specialty venue | |
| 50 Freestyle | SCY | 23.31 | AA+0.92s to AAA | 2024-11-09 | 2024 NE CRIM November Specialty venue |
| 100 Freestyle | SCY | 49.87 | AA+0.88s to AAA | 2023-02-17 | 2023 Region 1 Short Course Invitational |
| 200 Freestyle | SCY | 1:43.57 | AAA+1.38s to AAAA | 2025-03-28 | 2025 EZ North Speedo Short Course Sectionals venue |
| 500 Freestyle | SCY | 4:50.61 | AAA+12.82s to AAAA | 2024-10-18 | 2024 NE CRIM OCTOBER TEAM SPECIALTY W/ DIST venue |
| 100 Backstroke | SCY | 50.82 | AAA+0.03s to AAAA | 2025-03-29 | 2025 EZ North Speedo Short Course Sectionals venue |
| 200 Backstroke | SCY | 1:48.94 | AAAA | 2024-03-24 | 2024 EZ North Region Speedo Sectional Champs venue |
| 100 Breaststroke | SCY | 1:13.78 | B+2.29s to BB | 2025-01-04 | 2025 NE CRIM Jan Team Specialty venue |
| 200 Breaststroke | SCY | 2:30.65 | BB+7.46s to A | 2024-10-20 | 2024 NE CRIM OCTOBER TEAM SPECIALTY W/ DIST venue |
| 100 Butterfly | SCY | 53.28 | AA+0.39s to AAA | 2025-02-14 | 2025 Region 1 Short Course Invitational |
| 200 Butterfly | SCY | 1:55.67 | AAA+2.58s to AAAA | 2025-03-29 | 2025 EZ North Speedo Short Course Sectionals venue |
| 100 Individual Medley | SCY | 59.43 | 2024-09-29 | 2024 NE CRIM Battle of the branches slow pool | |
| 200 Individual Medley | SCY | 1:57.81 | AAA+4.32s to AAAA | 2025-02-14 | 2025 Region 1 Short Course Invitational |
| 400 Individual Medley | SCY | 4:09.42 | AAA+6.43s to AAAA | 2025-03-28 | 2025 EZ North Speedo Short Course Sectionals venue |
| 50 Freestyle | LCM | 25.94 | AA+0.05s to AAA | 2025-06-20 | 2025 NE CS June Summer Solstice |
| 100 Freestyle | LCM | 58.25 | AA+1.76s to AAA | 2025-06-20 | 2025 NE CS June Summer Solstice |
| 200 Freestyle | LCM | 1:58.99 | AAA+1.00s to AAAA | 2025-07-13 | 2025 NE CS LCM Senior Championships venue |
| 400 Freestyle | LCM | 4:38.87 | A+3.18s to AA | 2025-06-20 | 2025 NE CS June Summer Solstice venue |
| 50 Backstroke | LCM | 27.29 | AAAA | 2025-07-12 | 2025 NE CS LCM Senior Championships venue |
| 100 Backstroke | LCM | 58.96 | AAAA | 2025-01-01 | 2025 NE Swimming LC Senior Championships - Brown University, S#: NE25-0710CS venue |
| 200 Backstroke | LCM | 2:08.45 | AAAA | 2025-07-11 | 2025 NE CS LCM Senior Championships venue |
| 200 Individual Medley | LCM | 2:26.38 | A+1.39s to AA | 2025-06-20 | 2025 NE CS June Summer Solstice |
Cuts are USA Swimming single-age motivational standards (B → AAAA) at age 16.
Pool tags are a venue speed heuristic (median deviation of all swims there vs each swimmer's typical time) — see the venue page for the method.
Fastest relay legs
| Leg | Course | Time | Start | Relay | Date | Meet |
|---|---|---|---|---|---|---|
| 50 Backstroke | SCY | 23.68 | flat | 200 Medley Relay | 2025-03-29 | 2025 EZ North Speedo Short Course Sectionals |
Reconstructed from relay split marks. Flat = lead-off (comparable to individual times); flying starts run ~0.5–0.7s fast and are not PRs.
IMX / IMR
IMX 15-16 · SCY
5200 points (6/6 events)
| Event | Time | Points |
|---|---|---|
| 500 FR SCY | 4:50.61 | 859 |
| 200 BK SCY | 1:48.94 | 1048 |
| 200 BR SCY | 2:30.65 | 575 |
| 200 FL SCY | 1:55.67 | 924 |
| 200 IM SCY | 1:57.81 | 886 |
| 400 IM SCY | 4:09.42 | 908 |
IMR 15-16 · SCY
4155 points (5/5 events)
| Event | Time | Points |
|---|---|---|
| 200 FR SCY | 1:43.57 | 954 |
| 100 BK SCY | 50.82 | 992 |
| 100 BR SCY | 1:13.78 | 478 |
| 100 FL SCY | 53.28 | 845 |
| 200 IM SCY | 1:57.81 | 886 |
Scored against AAAA motivational base times: ordering is exact, absolute points run ~25% above the official USA Swimming scale.
PR splits
200 Freestyle SCY 1:43.57
Front half 50.84s · back half 52.73s
500 Freestyle SCY 4:50.61
Front half 142.77s · back half 147.84s
100 Backstroke SCY 50.82
Front half 25.05s · back half 25.77s
200 Backstroke SCY 1:48.94
Front half 53.33s · back half 55.61s
100 Breaststroke SCY 1:13.78
Front half 35.26s · back half 38.52s
200 Breaststroke SCY 2:30.65
Front half 73.88s · back half 76.77s
200 Butterfly SCY 1:55.67
Front half 55.60s · back half 60.07s
100 Individual Medley SCY 59.43
Front half 27.11s · back half 32.32s
400 Individual Medley SCY 4:09.42
Front half 116.62s · back half 132.80s
100 Freestyle LCM 58.25 split/total mismatch
Front half 28.30s · back half 29.95s
200 Freestyle LCM 1:58.99
Front half 58.13s · back half 60.86s
400 Freestyle LCM 4:38.87
Front half 134.52s · back half 144.35s
100 Backstroke LCM 58.96 split/total mismatch
Front half 29.05s · back half 29.91s
200 Backstroke LCM 2:08.45
Front half 63.20s · back half 65.25s
200 Individual Medley LCM 2:26.38 split/total mismatch
Progression
Faster times are higher. One card per event, all courses & history.