Science in Sport launched the Smart-1 energy drink last month alongside two new Go Bar flavours, Blueberry and Red Berry.

We’ve received a batch to test – and are impressed with the results so far. So we want you to try them for yourselves.

We’ve got three Berry Smart-1 sachets, three Blueberry Go Bars and four Red Berry Go Bars to give away – so, all in all, ten SiS products to keep you fuelled.

To enter, tell us about your ‘best’ bonk. That time, desperately searching your jersey pockets for a scrap of food, you forgot an energy gel for those last few miles home, or a bar to fuel that final climb.

The competition close at 5pm this Friday April 1, when we’ll pick our favourite.