A good beginner routine would be idea...first of find out ur max for bench...once u knw tht write it down... do 6 sets pyramid tht weight thts adding weight first 4 sets set and lowering reps like ths 1)55lbsx10 2)65lbsx8 3)75lbsx6 4) 85lbsx4 ...5th and 6th set same as the fourth set rest 1:30 sec between sets...next exercise incline dumbell flyes 6 sets with a weight u can do 10 reps with every set so 6 sets x10 make sure tht u keep ur upper back arched through th movement pulling with ur chest 1:30 sec rest between sets .. lower abs... 6 x failure of leg raises failure is whn one can't perform th next rep...absolute failure is whn u couldn't do anther rep even if u wanted to all six sets hit failure...rest 1:00 thn hit next set ...ths is a beginners routine...make sure to work all muscle groups tho...work one group on one day anther on th next day...
Mmm.... is there away u could get equipment?? Or anyway to u cud get access to equipment??
U can decent strength with bodyweight but building muscles ull eventually need more resistance....but we can start with wat we got...kinda like building the foundation strong and working on th house later..do u hav access to a park or playground? Some heavy tires or perhaps even a sledgehammers? Even with those things we can build a killer routine
Oh okkkk....so ur concerned bout only having 3kg dumbells and having to use mostly body weight exercise and said u should start strength training ...and ur asking for help for chest and lower abs and now ur saying ur parents r both gym members and let u go with thm but u dnt hav time because of school....okkkk...mmmm..I thnk I've answered ur question I knw I hav if u want lower abs better chest I've given u enough information to get it but if ur not serious and u dnt hav time it ain't gonna work anyway
Download an app that will calculate yout BMI from your age, height and weight. It will tell you then your ideal weight and BMI range.
App name: "BMI Calculator"
Hope this helps. Have a nice day!