acrobat
acrobatic
action
athlete
balance
balancer
body
business
businessman
circus
complex
complicated
computer
concept
contrary
decisiveness
determination
difficult
difficulty
elaborate
energy
equilibrium
equipoise
exercise
flexibility
gymnast
gymnastics
hard
internet
inverse
laptop
man
manager
monitor
notebook
power
problem
risk
stress
stressful
technology
trouble
tumbler
white
work
worker