Sun 5 Jul 2026 Chelmsford, Essex

Discovery Open Water Junior Triathlon

Unique open water, closed road Junior Triathlon. IRC qualifier for London, South East and East.

Sign up for £20-£35

Enter now

5 races

  • Sun 5 Jul
  • #1 of 5
ARU Writtle, Chelmsford

Tristart Duathlon

10:30

Age 7-8

£20

  • 400 m road running
  • 1.5 km road cycling
  • 200 m road running
  • Sun 5 Jul
  • #2 of 5
ARU Writtle, Chelmsford

Tri Star 3

10:30

Age 13-14

£35

  • 350 m lake swimming
  • 7.5 km road cycling
  • 2.4 km road running
  • Sun 5 Jul
  • #3 of 5
ARU Writtle, Chelmsford

Tri Star 2

10:30

Age 11-12

£35

  • 250 m pool swimming
  • 5 km road cycling
  • 0.8 km road running
  • Sun 5 Jul
  • #4 of 5
ARU Writtle, Chelmsford

Tri Star 1

10:30

Age 9-10

£35

  • 150 m lake swimming
  • 2.5 km road cycling
  • 1.2 km road running
  • Sun 5 Jul
  • #5 of 5
ARU Writtle, Chelmsford

Youth

10:30

Age 15-16

£35

  • 450 m lake swimming
  • 7.5 km road cycling
  • 3.5 km road running

Event overview

Event details

  • All fitness levels
  • Families
  • Spectators

Location

  • Changing facilities

Sustainability

  • Bring your own cup
  • Plastic bottle free
  • Sustainability policy

Races at event

  • Sun 5 Jul
  • #1 of 5
ARU Writtle, Chelmsford
Tristart Duathlon

10:30

Age 7-8

£20

  • 400 m road running
  • 1.5 km road cycling
  • 200 m road running
  • Sun 5 Jul
  • #2 of 5
ARU Writtle, Chelmsford
Tri Star 3

10:30

Age 13-14

£35

  • 350 m lake swimming
  • 7.5 km road cycling
  • 2.4 km road running
  • Sun 5 Jul
  • #3 of 5
ARU Writtle, Chelmsford
Tri Star 2

10:30

Age 11-12

£35

  • 250 m pool swimming
  • 5 km road cycling
  • 0.8 km road running
  • Sun 5 Jul
  • #4 of 5
ARU Writtle, Chelmsford
Tri Star 1

10:30

Age 9-10

£35

  • 150 m lake swimming
  • 2.5 km road cycling
  • 1.2 km road running
  • Sun 5 Jul
  • #5 of 5
ARU Writtle, Chelmsford
Youth

10:30

Age 15-16

£35

  • 450 m lake swimming
  • 7.5 km road cycling
  • 3.5 km road running
4 steps to wellbeing
Sleep well

A good night's sleep is an essential foundation for a healthy lifestyle, effective training and weight control.

Train slow

Low-intensity training is easier for you, reduces the risk of injury and helps builds an efficient aerobic system.

Eat natural

Cut out sugar & junk food, reduce carbs, eat natural foods and train your body to burn fat for fuel.

Get outdoors

Fresh air, natural light and reconnecting with nature all help to improve mental and physical wellbeing.