work your way up to jogging/running. walk first you will get tired then as that becomes easier after you have walked for about fifteen min. go for a jog for as long as you can(till u feel u might not take anymore) then slow down and walk. do this in intervals untill you are jogging more then walking. it helps to strengthen the heart also. but be sure u are cleared for jogging/running some people are restricted in their abilites due to cardiac problems, joint disorders and certian eye conditions.