| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:20.32 | Winter Classic | 2026-01-16 |
| 100m Backstroke | 1:14.96 | 2025 Prairie Winter International | 2025-12-11 |
| 100m Breaststroke | 1:34.55 | Goldfins Winter Whiteout | 2026-02-06 |
| 100m Breaststroke | 1:28.57 | Spooktacular Goldfins Invitational 49 | 2025-10-24 |
| 100m Freestyle | 1:13.33 | Goldfins Winter Whiteout | 2026-02-06 |
| 100m Freestyle | 1:12.61 | Spooktacular Goldfins Invitational 49 | 2025-10-24 |
| 100m IM | 1:18.19 | 2025 Prairie Winter International | 2025-12-11 |
| 200m Backstroke | 2:52.27 | Winter Classic | 2026-01-16 |
| 200m Backstroke | 2:40.73 | 2025 Prairie Winter International | 2025-12-11 |
| 200m Breaststroke | 3:26.95 | Goldfins Winter Whiteout | 2026-02-06 |
| 200m Breaststroke | 3:07.47 | Spooktacular Goldfins Invitational 49 | 2025-10-24 |
| 200m Freestyle | 2:41.79 | Goldfins Winter Whiteout | 2026-02-06 |
| 200m Freestyle | 2:40.99 | Craven SPORT Services Racing Series #2 | 2025-11-15 |
| 200m IM | 3:00.57 | Winter Classic | 2026-01-16 |
| 400m Freestyle | 5:53.70 | Winter Classic | 2026-01-16 |
| 400m IM | 6:37.98 | Winter Classic | 2026-01-16 |
| 50m Backstroke | 36.47 | Winter Classic | 2026-01-16 |
| 50m Backstroke | 35.54 | 2025 Prairie Winter International | 2025-12-11 |
| 50m Breaststroke | 39.83 | Spooktacular Goldfins Invitational 49 | 2025-10-24 |
| 50m Butterfly | 37.22 | Winter Classic | 2026-01-16 |
| 50m Butterfly | 37.47 | Craven SPORT Services Racing Series #2 | 2025-11-15 |
| 50m Freestyle | 33.10 | Goldfins Winter Whiteout | 2026-02-06 |
| 50m Freestyle | 33.04 | Norm Banfield Memorial Open Development Meet | 2025-10-03 |
| 800m Freestyle | 11:59.87 | Goldfins Winter Whiteout | 2026-02-06 |
| 800m Freestyle | 12:50.06 | Spooktacular Goldfins Invitational 49 | 2025-10-24 |
Armstrong, Lennox's top personal bests include 100m Backstroke (1:20.32), 100m Backstroke (1:14.96), 100m Breaststroke (1:34.55), 100m Breaststroke (1:28.57), 100m Freestyle (1:13.33).
Armstrong, Lennox swims for Team Gold.
Armstrong, Lennox has competed in 7 meets.