Home > Newsletters > Daily: Love or hate Earth Hour? > Daily Dose: Neglected rural pets pose scabies risk for humans > Health-in-Motion Updated 17 September 2015 Abs right You're doing it wrong: When doing crunches, you're just lifting your shoulders off the ground and flexing your ab muscle (rectus abdominus) without engaging the waist or the lower abdomen (obliques and transverse abdominus). This could create a muscle imbalance which may result in back problems if you don't focus on your inner core muscles. Planking is a more beneficial alternative to crunches as it also works the transverse abdominus muscle (your core). 0 More: Daily Dose: Neglected rural pets pose scabies risk for humansHealth-in-Motion advertisement Other news Medical SEE: 5 of the most common fungal skin infections Medical I found out I was pregnant and HIV+ at the same time Medical ADHD: From 'barking dogs' to increase in diagnosis Medical Peanut allergy? Other nuts may be fine Medical SEE: 5 ways to avoid backache during pregnancy Parenting WATCH: Fighting for inclusive education for children with Down syndrome From our sponsors How to care for your vaginal flora Live healthier Hello? » SEE: Interesting facts about hearing loss Earworms: Let it go Is it bad to sleep with earplugs all the time? SEE: Do women hear better than men? The reason why men often appear not to be listening could be because they actually can't hear you. Confident smile? » Acidic drinks can harm your kids' smiles The facts on bleaching your teeth Am I taking good care of my teeth? Why are my teeth stained? We know the rules – brush your teeth twice a day and floss to keep them healthy. But, have you ever wondered what causes those stains that sometimes appear?