If the seat has a back it is important for the first few weeks to push the back as far back as possible so that you are using the seat only. Adjust the tilt until you are as comfortable as can be considering your current fitness. This will improve and as it does, the seat can be brought to a more central position. Some men have difficulty in adjusting and this is made easier by having the seat tilted down at the front to the maximum and adjusted to a neutral position. Also, when sitting down, sliding back onto the seat helps to position the male parts more comfortably, the same as horse riders.
Some people experience tightness in thighs and hips.
Again your body will adjust. The position with your knees apart greatly reduces the chance of hip joint disease at a later age. Tight muscles, tendons and ligaments will soften and relax, which is desirable.