I really like these bands for travel workouts. They take virtually no space in your bag and provide enough resistance for a respectable workout. It's hard to quantify how much weight each one represents. For a thorough workout for each muscle group, it pays to get the extra heavy, heavy and medium bands. Honestly, it's good for some muscle groups, like the triceps, biceps, shoulders and even the back. I haven't used the door attachment, but for the chest, good old-fashioned pushups will do the trick on the road, won't they? As you adjust your foot position on the rubber, you increase or decrease the resistance. Certainly worth the money, as many hotels have sub-standard guyms and 15 minutes with these bands can work you out just fine.