Famously Unfit for Sport Relief follows entertainer Les Dennis, presenter Susannah Constantine, actress Tameka Empson and comedian Miles Jupp as they embark on a muscle-grinding mission to regain their fitness, while trying to inspire the British public to do the same and get active for Sport Relief.

Over the course of ten weeks, the foursome run, climb and swim their way back to fitness, culminating in one of the UK's hardest and most demanding physical challenges, a muddy and exhausting assault course in freezing temperatures.

The four team members have all acknowledged their personal struggles to keep in shape. As well as fighting their own personal battle, they test the latest science which suggests getting fit in a group is much easier than doing it on your own.

Helping them on their way are former Olympian and sports scientist Professor Greg Whyte OBE and Trust Me, I'm A Doctor's Dr Zoe Williams.

The show also features visits to two Sport Relief-funded projects in the UK. These projects are just some of the ways in which money raised through Sport Relief helps vulnerable people in the UK and across world to live happier and healthier lives. Show less