What is a key reason sport divers should avoid decompression diving?

Sport divers should avoid decompression diving primarily because sport diving typically relies on the no-decompression limits established for safety. Decompression diving involves planned stops during ascent to allow nitrogen to safely off-gas from the body after deeper or longer dives. This requires a greater understanding of dive planning, dive profiles, and gas absorption rates, which can complicate diving for those who are not trained for such practices.

Using dive computers for planning is relevant because these devices help divers manage their exposure to nitrogen and monitor their ascent rates in accordance with the specific no-decompression limits. However, divers operating outside of these limits without the proper training and planning could increase their risk of decompression sickness. Therefore, while employing dive computers is essential for safe diving practices, sport divers should generally stick to no-decompression profiles to simplify their diving experience and enhance safety.

The other options, such as combining different diving techniques, limiting the number of dives in a day, or ensuring all dives are deep, do not directly relate to the primary reason sport divers avoid decompression diving. These factors may influence a diver's planning but do not fundamentally address the risks and complexity associated with decompression diving itself.