The race commences with a tide assisted sea swim along the coast .
The race continues with multiple 4km laps of a mainly flat but challenging off - road bike course behind the sea wall towards Frinton - on - Sea and back .
The race commences with a tide assisted sea swim along the coast and continues with multiple 4km laps of a mainly flat but challenging off - road bike course behind the sea wall towards Frinton - on - Sea and back .