I’ve noticed significant improvements in my fitness levels after a few weeks.

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You'll see significant improvements in your fitness if you stick with your workout routine.

Since I started exercising regularly, I've noticed a significant improvement in my fitness.

Have you noticed any improvements in your fitness lately?

If I hadn't started exercising, I wouldn't have seen such significant improvements in my fitness.

I have observed substantial enhancements in my fitness levels following a period of several weeks.

My fitness has gotten a lot better in the past few weeks.

I'm much fitter now after a few weeks.

Noticeable and substantial positive changes.

A person's physical condition and ability.