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Want to see how the battle of the bulge is being won in the 21st Century? Log on to the Internet and check out these diet and exercise sites.

Weight Watchers

WEIGHTWATCHERS.COM

Price: Plans are $16.95 a month, plus a $29.95 sign-up fee, or $65 for a three-month prepaid subscription, which includes the sign-up fee.

– Provides the resources needed to follow the Weight Watchers plan step by step online, including interactive tools to help you manage daily food choices and activities.

Sonoma Diet

SONOMADIET.COM

Price: $5 a week.

– Based on The New York Times best seller by Connie Guttersen, the focus here is three waves of dieting, from curbing specific cravings for the first 10 days to the actual weight-loss phase to maintaining your weight once you’ve reached your goal.

Spark People

SPARKPEOPLE.COM

Price: Free

– This site has many of the same bells and whistles offered by the paid sites, including personalized diet and fitness plans, daily trackers, fitness demonstrations and videos, articles, experts and community support.

Diet Health

DIET.COM

Price: Plans range from $39.90 a month to $139.95 for an annual membership.

– Customized for your specific personality type and lifestyle. Includes meal plans, exercise demos, private consultation with program founder Dr. Robert Kushner via e-mail and message boards, as well as personal coaching and meal reviews by registered dietitians.

Diet Watch

DIETWATCH.COM

Price: Plans are $38.87 for three months, or $77 for an annual membership.

– One of the first Internet-only weight-loss programs. Offers personalized diet and fitness plans, community support and live chats with experts.

American Council on Exercise

ACEFITNESS.ORG/GETFIT

Price: Free

– The extensive Web site blends analysis of the latest fitness headlines with an archive of facts and how-to’s. You can use what you want: Browse the exercise library’s photos and instructions, print PDFs of fitness facts, find health clubs and professionals by zip code or dive into discussion boards.

GetFit

GETFIT.COM

Price: $10 per month for the GetFit Fitness System, $49 per month for online coaching.

– GetFit’s comprehensive fitness profile generates an interactive lifestyle calendar tailored to you. It spits out a monthly workout schedule accompanied by pictures and videos that demonstrate proper technique.

PumpOne

PUMPONE.COM

Price: $1.99 for one-day access to a workout on your cell phone, $19 for a four- to six-week training program, $49 for a 12- to 18-week program.

– Exercise regimens are available for download to both Mac- and PC-based video mp3 players and to BlackBerrys, cell phones and similar mobile devices.

Revolution Health

REVOLUTIONHEALTH.COM

Price: Registration is free, and prices will be finalized when the site formally launches next month.

– The site’s Healthy Living section dives into such topics as sports nutrition, getting rid of back pain and how to exercise properly without surrendering to a costly gym membership.