The celebrity studded reality show <em> Fun on the Run</em> is getting tougher and trickier by the week. If Pondicherry, last week, tested the grit and muscle power of the contestants in <em> Fun on the Run</em>, then, this week, hot Chennai, will go a step further and test how far the teams can go to win the grand prize of 25 lakhs. Apart from making the celeb contestants go through back breaking tasks which exhaust them completely, the show is playing tricks on the contestants as it happened this week in Chennai.