Write the next sentence in this paragraph:

How to prepare for a high altitude hike
Begin training well in advance.
Plan the amount of training you will do based on the difficulty of your hike, and your current fitness level. If you are reasonably fit, and attempting a challenging hike, then you will probably want to schedule at least 5 months of training before your hike is scheduled.

Options are:
[a]. Acquire or purchase any equipment you need to begin your hike. The hike is a multi-day hike and you will need the following items : Spf 245.
[b]. If you are really out of shape, you may need to train for much, much longer. Remember that you can never start training too early, but you can start too late.
[c]. The most effective time for weight training is between spring and fall when your peak fitness levels start. Other times of year, the mountain hiking season takes place, and you will need to do two full days of light exercise.
[d]. Learn the hiking routes you will take. Look up hiking trails on national park websites to learn about hiking routes they offer and where the trails will be located.
[b].