adjust the firmness (JumpSport Fitness Trampoline Mode 250)

My order has arrived. The default setting is Soft Setting. In the menu, it says "if you wish to change the firmness of your reboounder, turn it upside down, Then pull cord tighter to different knot. It looks simple, but there are so many cords and it will take a while to reset the knot for each cord. Any suggestion on that? I want to set it to medium.

我做广播操最后一节：20 分钟。

所有跟帖： 

• 不需要重新打结了吗? Mine only has one knot on each cord. -kathyzh- ♀ (0 bytes) () 07/24/2015 postreply 16:47:52

• Model 250 does not have three settings -kathyzh- ♀ (242 bytes) () 07/24/2015 postreply 16:56:52

• so you can not change the setting？ -萧紫箬- ♀ (0 bytes) () 07/24/2015 postreply 17:52:10

• 借贴问一下，跳完后后颈椎有点不舒服，正常吗？以前没有发现颈椎有问题，还是慢慢适应就好了。 -爱吃甜食- ♀ (0 bytes) () 07/24/2015 postreply 18:35:49

• I jump for about 20 minutes, no 颈椎问题. Do you do some other exerc -kathyzh- ♀ (0 bytes) () 07/25/2015 postreply 07:14:03

• 我准备跳一个月试试看，我现在每天跳两次，每次15分钟。跳的时候觉得头有点震，这两天好像适应点了。 -爱吃甜食- ♀ (0 bytes) () 07/25/2015 postreply 08:23:08

• 我在考虑买你的这个型号，JumpSport Fitness Trampoline Mode 250 还是Costco: Jump -longnv- ♀ (27 bytes) () 07/25/2015 postreply 07:39:55