Pressing your tongue to the roof of your mouth while performing abdominal exercises takes a little strain off the neck. Try it!
The average human head weighs 8 pounds. That’s a lot of weight for your neck to support. And proportional to its size, the tongue is the strongest muscle in the human body! Why not put it to good use until your neck muscles get stronger?
If you’re new to your exercise routine and your neck bothers you a lot doing ab exercises on your back, try standing ab exercises, like frankensteins and steam engines.