Uday, Sunny Leone in 'plank off' competition

Actor-producer Uday Chopra challenged actress Sunny Leone to a planking exercise on Thursday. Taking to the micro-blogging website Twitter, the duo started off with a discussion over exercises and planks when Uday challenged Sunny with an image of himself in the midst of a planking exercise at the gym. The Twitter conversation started with Sunny and her trainer Prashant. While Sunny tweeted: "Hardest plank I do with prashant six pack for 1min, form is important, don't hurt yourself!". Prashant responded to her tweet and wrote: "Sunny Leone you have got two more extra points for this plank. Thanks for support."