The key to prevent chafing is to avoid sweating and friction between body parts. To do this try to keep yourself dry, put proper clothes; try to wear hundred percent cotton clothes etc. Try to stay hydrated by drinking plenty of water. This will allow you to perspire freely. use talcum powder to stay dry. Always wear clean and dry clothes use petroleum-free and non-staining lubrication to prevent friction while walking, jogging or exercising. You can also use it on your feet, toes etc to avoid blisters.

Tips to prevent chafing

Stay hydrated

Drink plenty of water to prevent dehydration. Among other things, staying well hydrated will help prevent chafing by allowing you to perspire freely. When you stop perspiring your sweat will form salt crystals on your body increasing friction.

Select the right clothing

Select snug fitting (but not tight) clothing. Shorts or jog bras that are too tight or too loose will create friction and rubbing.
Choose breathable, wicking fabrics.... coolmax, supplex, polypro, etc are good choices. no cotton!
clothing should have few seams, flat seams, and small flat stitching.
Do not wear untested clothing on a long walk and never wear unwashed new clothing.
 

Stay dry

Use talcum powder or cornstarch to stay dry.