What type of exercise to do if you want to lose weight in 3 weeks?

I'm on Christmas vacation for 3 weeks. I'm in summer so I can exercise outside.

I want to lose 3-5kgs by the time I go back to work.

I've taken all the bad food out.

Is walking 10000 steps and running on the treadmill enough?

I don't do gyms.

Thank you in advance

What type of exercise to do if you want to lose weight in 3 weeks?
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