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Rectangular trampolines are generally made of more durable materials than round ones because design requires stronger materials. They have criss-crossed springs to draw tension even, and create a uniform bouncing surface. You can buy rectangular trampolines in sizes starting as small as 10 feet in length.
By contrast, round trampolines have springs positioned around perimeter and tension tends to make a 'sweet spot' in very center. If you move out of center, focus of tension shifts, making it harder to maintain your balance. The frame needed is lighter, and can be made of less expensive materials, making them cheaper to buy than other shapes.
There are special considerations if you're buying a trampoline for garden or yard for children to use. Pediatricians and children's safety experts warn against allowing children to use standard trampolines for a number of reasons. These include possibility of little fingers getting caught in trampoline springs, children falling off edge of trampolines and children injuring themselves attempting tricks that they aren't ready for. Because of those safety concerns, there are trampolines designed specifically for children that use a different style of spring, and accessories available to make trampolining safer for them. Among those are enclosure nets and non-slip surfaces.
Ian Wide contributes to many sport and leisure sites such as home fitness equipment and trampolines.