Write the next sentence in the following story.

How to walk with two hiking sticks
When buying hiking poles, buy the ones that are easily adjustable such as those with the twisting lock.
The higher priced ones have more durable hand grips, but otherwise the lower prices ones' locking mechanisms are sturdy.
Cut two short lengths of cord and tie your retracted hiking poles together when you are not using them.

Select from:
a). Walk for 5-20 minutes a day. This will vary slightly depending on what sport you play and what sort of terrain you normally take a hiking hike on.
b). Before you put your hiking poles on start at a sunny place that gets lots of sunlight. Even though the weather should remain warm (around 60 to 95 f), it is best to hike on a warmer day.
c). Before using these poles, you should do some upper body exercises. A low intensity chest and upper back exercise with light dumbbells or cables will do.
d). Use both poles : The shorter each pole has, the cheaper it will cost. Be mindful of the choice that you make on the brand you use, as plants will usually charge quite a bit more for brands they cannot handle.. The answer should be
c).