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Maybe you can't run...you hurt your knee or something. Maybe you don't want to run. That's ok! Walking is a great exercise. You could get more intensity from it by doing these things:
Move at a challenging but sustainable pace.
Add weighted resistance.
Vary your walking speed with intervals.
Walk at a higher elevation.
Breathe through your nose vs. your mouth.
Walk in the sand.
Incorporate strength exercises.
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