siedzący tryb v angličtině:

sedentary life-style

A sedentary lifestyle is said to be a very important risk factor for heart disease.

Even if you’re not overweight, people your age lead sedentary lives.

and a sedentary existence, our friend here decides to act.

If you've been sedentary, start walking three times a week at a stroll for 20 minutes.

I led a very sedentary life. / It's very sedentary activity. / So, my job is pretty sedentary, but not my life.

tending to spend much time seated; somewhat inactive. "we all walk a certain amount every day even if we are sedentary" (sedentário)