present progressive for repeated action

[ostap77]

"You need to walk for at least 30 minutes a day for your body to derive any significant effect from walking."

OR

"You need to be walking for at least 30 minutes a day for your body to derive any significant effect from walking.

Could I use the present progresive to mean a relatively long period of time?

[bhaisahab]

"You need to walk for at least 30 minutes a day for your body to derive any significant effect from walking."

OR

"You need to be walking for at least 30 minutes a day for your body to derive any significant effect from walking.

Could I use the present progresive to mean a relatively long period of time?

It's not natural English.

[ostap77]

It's not natural English.

Is it unnatural because I indicated a specific period of time?

Would this sound better?

"You need to be walking every day for your body to derive any significant effect from walking

[bhaisahab]

Is it unnatural because I indicated a specific period of time?

Would this sound better?

"You need to be walking every day for your body to derive any significant effect from walking

No, it doesn't sound better, IMO.