because the floor is getting its revenge on you jumping on it so hard!
a soft floor usually has carpet and a hard floor has wood or other things that are hard.
You don't it's hard!
In wrestling Soft floor is provided because in hard floor the time of impact increases as a result the rate of change of momentum increases which means more force and then from Newton's third law the reaction force of floor also increases and wrestler get more injuries and damages.
no seriously
Home Depot sells hard floor cleaner. hard floor cleaner cleans your hard floor in no time. it cost around 30 dollars but it is really effective. I have bought some myself.
Grass 8 to 11 centimeters, Hard Floor 8 to 12 centimeters, Spring Floor 10 to 15 centimeters
(severity) The seriousness of his injury had his family worried that he might die. (solemnity) The President found it hard to maintain his seriousness when pardoning the Thanksgiving turkey.
the floor is too hard
If it is on hard wood floor spit on the floor and rub your shoes in it to get a grip on the floor.
Seriously? 20 million man hours of hard slog and testing,testing, testing.
A tarantula usually moves slowly, it's only fast when it's hunting, so it's kinda hard to compare... Jumping spiders are fast by jumping
The floor is very hard.