Final answer:
In the given text, two new paragraphs can begin at the points where the text introduces the growing popularity of skateboarding and Jack Tumble's excitement about its future.
Step-by-step explanation:
In the given text, two new paragraphs should begin at the following points:
- Originally a fringe hobby for surfers on days when the sea was calm, skateboarding has been enjoying a growing popularity for many years now.
- Jack Tumble, a professional skater from the 90s who has recently made the transition into coaching, is excited about the future of skateboarding.
Both of these statements introduce new ideas and perspectives, and starting new paragraphs at these points will help organize the information and provide clear transitions.