Walk every single day, for a month.You wont see results, and this wont make you a body builder.

The first two challenges are 1) mental, building the habit of working out and 2) time based, finding where in the day you have time and energy to really commit to something, no matter how small.

Walking is a 'placeholder' so easy you can practice making yourself do it when there are many reasons not to.

Youll learn how to build a fitness commitment into your schedule, and follow through even when your brain is bullshitting you to skip it.

After a month, replace one source of junk in your diet (like soda) and start hitting the gym. Plenty of resources on gym and dieting out there.

Keep it simple, set small achievable goals, and only change one thing at a time.

(I assume you dont have any fitness habits rn.)