Cheng-Yook (Ysa) Lai
ID 856736
Born : 1970 Cat. W55 Ultrarunner since 2015 MAS
32
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
47
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?MASMalaysia
35,4%
Rank quotient ?This runner's calculation uses 32 eligible race(s): Σ(rank − 1) = 1 347; Σ finishers = 3 805. 1 347 / 3 805 × 100 = 35.40%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed32
Km — ultra races2 711 km
> 100 km7
> 160 km1
> 24h7
> 48h1
Longest race200,0 km
2nd Taman Jaya Ultra 48h — 9/7/2022

Km per year (ultra races)

601
6 races
2022
606
7 races
2023
50
1 race
2024
50
1 race
2025
50
1 race
2026

Race types (share of distance)

Road88,8%
Trail5,7%
Stage5,5%

Wins & podiums (ultra)

🏆 Win0
🏆 Win F5
🏅 Top 31
🏅 Top 3 F14
Longest winning streak0
Current streak0

Records

50 km5h00'40100 km13h41'486 h54,00 km12 h85,10 km24 h150,00 km48 h200,00 km

HISTORY

32 race(s)
DateRacePerf.Rk
2026
07.02 50km MAS11th Route 68 Challenge - 50 km 8:56:47 h141
2025
23.02 50km MAS10th Route 68 Challenge - 50 km 8:51:47 h168
2024
07.01 12h MAS6th Bukit Kiara Ultra Challenge 50.000 km30
2023
02.12 12h MAS1st KL Sundown 2023 54.000 km54
18.11 24h MAS6th Universiti Malaya 24 hours Ultra Marathon 100.800 km18
10.06 16h MAS8th Watergate 16hr 100.000 km22
29.04 24h MAS3rd Taman Jaya Ultra 24h - A 117.660 km4
19.03 50km MAS8th TITI 50km Road Ultra Marathon 6:15:23 h23
04.03 100km MAS8th Route 68 Challenge - 100 km 13:41:48 h20
25.02 84km MAS5th UiTM Ultramarathon 84 km 12:15:42 h10
2022
17.12 12h MAS4th 12 hour Bukit Cinta Ultramarathon 76.800 km10
27.08 6h MAS1st Kuala Lumpur Endurance Run 54.000 km10
09.07 48h MAS2nd Taman Jaya Ultra 48h 200.000 km3 🥉
21.05 100km MAS7th Route 68 Challenge - 100 km 13:48:44 h25
14.05 10h MAS7th Girls on Pink 50 70.000 km9
05.03 100km MAS7th TITI 100km Road Ultra Marathon 14:19:08 h22
2020
11.04 50km MAS4th Sungai Menyala Forest Trail 5:00:40 h5
01.02 84km MAS4th UiTM Ultramarathon 84 km 13:06:10 h27
2019
28.12 12h MAS3rd Malatra Endurance Run 12h 78.400 km9
16.11 24h MAS5th Universiti Malaya 24 hours Ultra Marathon 129.578 km11
19.10 24h MAS7th Back 2 Endurance 12/12 Hour Stage Race 150.000 km4
19.01 16h MAS6th Watergate 16hr 50.000 km247
2018
20.10 24h MAS4th Universiti Malaya 24 hours Ultra Marathon 132.509 km9
30.09 12h MAS6th Back 2 Endurance 12 Hour Run 85.100 km15
29.04 50km MAS4th Route 68 Challenge - 50 km 6:37:46 h79
17.03 100km MAS5th TITI 100km Road Ultra Marathon 17:34:37 h224
2017
21.10 24h MAS3rd Universiti Malaya 24 hours Ultra Marathon 102.500 km18
10.09 12h MAS5th Back 2 Endurance 12 Hour Run 73.600 km35
19.03 50km MAS4th TITI 50km Road Ultra Marathon 6:49:57 h48
2016
03.12 12h MAS2nd 12 hour Bukit Cinta Ultramarathon 75.000 km20
04.09 12h MAS4th Back 2 Endurance 12 hour Run 73.600 km24
2015
14.06 12h MAS3rd Back 2 Endurance 12 hour Run 69.000 km35