Starting with running together at the Bear Trail Challenge (BTC) I in July 2016, then continuing on BTC II 29 January 2017 and BTC III March 2018, in 2019 this Indorunners Balikpapan (BEAR) will again hold BTC IV, let’s prepare yourself to run together in the Fourth Bear Trail Run Challenge which will be held on Sunday 03 February 2019.