Your abs are being worked out,it's one of the best work-outs for abs!So get started!I started out doing planks for 30 seconds once a day and I am working my way up!Also if you feel your abs burning then that means your abs are responding to the work-out naturally.Remember if you breath it's not that bad,so breath!Always keep your back and hips straight.So there you go I hope I helped you out!!!
its an isometric contraction.
the muscles remain the same length and shape throughout the position.
core
Because your muscles are contracting and blood is filling the muscles being worked ( thats why your veins bulge when lifting)
A plank primarily engages the back, shoulder, and abdominal muscles. Most notably, these include the erector spinae, rectus abdominis, transverse abdominus, trapezius, pectorals, and deltoids.
quads and gluteous and your primary muscles being worked during a lunge.
The traditional plank works out not only your abdominal area, but also your thighs and butt. :) A side plank does all that and works on the muscles in the arm supporting the plank.
It uses mostly legs but also traps, back, lower back, and several other muscles.
Isometric stretches are when your muscles are contracted and held that way. It is the opposite of dynamic stretching where your muscles are lengthening and contracting. An example of an isometric stretch is the plank; where you're resting on your forearms and your toes. Your abdominal muscles are being contracted but there is no lengthening and contracting movement. Dynamic stretching would be doing a pushup.
Your use youe leg muscles
yes it is (even if you don't get bigger your muscles are still being worked out
If you are referring to the dumbbell bench press, which works both arms independently, then the muscles being worked are mainly the pectoral and tricep muscles. Other muscles that are indirectly involved are the shoulder (deltoids and trapezius) and the lats (latissimus dorsi).
The Transversalis abdominus can be worked out with tummy tuck, planks, plank with leg lifts and transverse pulls. The single most effective exercise to isolate this area is the stomach vacuum.
Abdominal muscles, among others.