Parkrun is a free 5k running event which takes place all over the world on Saturday mornings. In Japan, it starts at 8 a.m. The most popular events with TnTers are Futokotamagawa Parkrun (二子玉川) and Maborikaigan Parkrun (馬堀海岸) near Yokosuka. It is a good idea to check the Facebook pages of these events, as they sometimes get cancelled due to bad weather. It is possible to do one of these Parkruns and then join the 10 a.m. open water swim in Hayama.