Hi all ,
I watch scooby videos , and am exercising here and there but am now going to try to do 100 push ups ( 5x20 ) and 100 sit ups ( 5x20 ) . My body mass index is 21 , i have low fat so i think this will be relatively easy for me. I have started with this idea few days before new year and am trying to workout every second day. Basic goals are faster metabolism , bit more muscle and better sleep .
After about 20 days i can do 20 , 12 , 10 , 8 , 8 push ups then i switch to knee push ups and finish until 20 in each series.
I work with things that scooby is using for hand grip ( i dont know how is that called ) .
Q1 : I have great tension and pain after push ups in my triceps and not so much in my chest and almost no in my biceps , am doing shoulder or mb a bit wider grip . Should i change something so that my triceps are not so under fire and to get more focus on chest ?
That just means your triceps are currently the weak point for that exercise. Don't change anything and stick with it.
Q2 : Am making about 90 second or a bit more brake time after each serie . Should i cut down rest time to 60 sec or less ?
90s should be fine. In general you should rest just enough so you can do the next set, eventually you'll get a feel for it.
After few days i could do 5x 20 sit ups ( 3x basic sit up 2x bicycles )
Q3 : Should i do more sit ups ? More series or more in each serie ? If am doing bicycles i dont need planks ?( when i do planks i cant do alot cos pain in my elbow and not in my abs )
I'd suggest doing something harder to keep it challenging. Like reverse crunches:

In general, if you can do 25 or more reps, you should go with something harder.
If you have a pull up bar to hang from, work your way up from knee raises, to leg raises (when you legs are paralel to the floor), to a full leg raise (almost knee yourself in the face

):

Q4 : I have tension in
upper abs not so much in lower abs , is this normal ? and will i have evenly distributed after a while ? Should i do something for lower abs ( plz suggest something less acrobatic

)?
Only 4 questions for now but i will remember few things more soon

thx
The rectus abdominis is actually only one muscle, a crunch will work the whole thing:

The different divisions in the 6, or 8, pack are purely visual, from where the tendons go across and how deep they are.
More on the "lower abs" here: