physical exertion

exertion   /ɪg'zɜːrʃn/　n)肉体的･精神的な努力、取り組み

★ physical or mental effort; the act of making an effort

・She was hot and breathless from the exertion of cycling uphill.

・He needed to relax after the exertions of a busy day at work.

physical exertion

the activity of exerting your muscles in various ways to keep fit

・The physical exertion required by his work kept him fit.

exert   /ɪg'zɜːrt/　v)権力を行使する、肉体的･精神的な努力、取り組みをする

★exert something     to use power or influence to affect somebody/something

・He exerted all his authority to make them accept the plan.

・The moon exerts a force on the earth that cause the tides.

★exert yourself     to make a big physical or mental effort

・In order to be successful he would have to exert himself.