Take up this 30 day crunch challenge and tone up and boost your core body muscles to the max.
This challenge gives off the best results – if you stick to it and complete all 30 days !
The challenge has 1 exercise which you have to do each day, and the time spent doing the exercise slowly increases day by day to help you build up your core body muscle strength gradually, ensuring you are able to complete the final day of the challenge easily.
You only have to do the amount of time shown on the challenge chart once per day, however if you are feeling brave then you can repeat each day’s challenge as many times as you like. -Source