You do not have to walk for hours, count calories or steps. A brisk 20-minute daily walk has many health benefits and covers your recommended 20 minutes of exercise a day. If you want to do more gradually increase your pace or distance (not both at the same time though).
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In 1 hour Men age 17-25 should be able to walk about 7 miles. Men 25-35 should manage about 6.7 miles. Women in the 17-21 age range, comfortably reach 6.9 miles with Women 25-35 achieving 6.6 miles.
Over 35s Men over 35 on average walk roughly 6.5 miles in an hour. Women over 35 a little less, 6.3 miles.
Over 60s Men over 60, on average walk 6.2 miles in an hour while Women over 60 walk 6.1 miles.
Safety It goes without saying, consult your doctor before starting any exercise program especially as you get older, if you have health concerns or have not had a recent check up.
Calories Burned based on Time and Weight.
Calories Burned in 30 minutes
Weight 100lb:83
Weight 120lb:100
Weight 125lb:104
Weight 150lb:125
Weight 175lb:146
Weight 200lb:167
Weight 250lb:208
Weight 300lb:250
Calories Burned in 40 minutes
Weight 100lb:111
Weight 120lb:133
Weight 125lb:139
Weight 150lb:167
Weight 175lb:194
Weight 200lb:222
Weight 250lb:278
Weight 300lb:333
Calories Burned in 45 minutes
Weight 100lb:125
Weight 120lb:150
Weight 125lb:156
Weight 150lb:188
Weight 175lb:219
Weight 200lb:250
Weight 250lb:313
Weight 300lb:375
Calories Burned in 1 hour 15 mins
Weight 100lb:208
Weight 120lb:250
Weight 125lb:260
Weight 150lb:313
Weight 175lb:365
Weight 200lb:417
Weight 250lb:521
Weight 300lb:625
Calories Burned in 1 hour 15 mins
Weight 100lb:208
Weight 120lb:250
Weight 125lb:260
Weight 150lb:313
Weight 175lb:365
Weight 200lb:417
Weight 250lb:521
Weight 300lb:625
Calories Burned in 1 hour 30 mins
Weight 100lb:250
Weight 120lb:300
Weight 125lb:313
Weight 150lb:375
Weight 175lb:438
Weight 200lb:500
Weight 250lb:625
Weight 300lb:750