Gist
Yes. Power walking is useful for general fitness because it improves aerobic capacity, endurance and daily activity, although strength training is still needed for a complete programme.
Yes. Power walking can build aerobic and walking endurance by training you to sustain a faster purposeful pace for longer before fatigue forces you to slow.
Yes. Power walking can improve cardiovascular fitness by raising heart rate and breathing into a sustained aerobic training range without requiring running.
Yes. Power walking can support fat loss by increasing energy expenditure with manageable recovery, but body-fat reduction still depends on a sustained calorie deficit.
Yes. Power walking can support weight loss by increasing walking intensity and energy expenditure while remaining lower impact than running for many people.