At the end of the day to get something to change/grow/become stronger - you train it.
Yes I have to agree, but it does not mean that you need to do specific fore arm work or calf work for them to develop, however I guess it would help and would also depend on your goals.
To me at this stage in my training, it's about 'bang for buck', or in other words 'results vs effort' as I have very limited time available to me for training, I can fit in about 4 half hour sessions at the moment without compromising on other things, so as a result I have cut pretty much ALL isolation stuff, and just spend my half hour doing large heavy compounds in various rep ranges ranging from sets of 30 reps to heavy singles.
Obviously I could train more (everyone can) but I currently work 10hr shifts, then I take my dogs out daily (which is good for me as well) for at least 30 minutes to an hour every day, some days twice (morining and night) yesterday I did a 8km walk am and a 10km bike ride pm with them, today will be bike ride after work.
I have found no detrimental affects from changing my training and dropping MOST isolation work, I must say I still fit in some arm curls. I also use my captains of crush hand grippers in the car when driving to work.
My routine is sort of based on the '5/3/1 Boring but Big', but not using the 5/3/1 progression, but might start using it again in a few months time. Low rep exercises are 3 sets of 5-12 reps (sometimes will do more sets and lower reps down to heavy singles when I feel like it) and high rep are three sets of 15-30 reps
MONDAY : heavy military press (low rep), bench press (high rep), db arm curl (high rep)
TUESDAY : heavy dead lift (low rep), squat (high rep), bent over rows (low rep), abs
THURSDAY : heavy bench press (low rep), military press (high rep), bb arm curl (low rep)
FRIDAY : heavy squat (low rep), dead lift (high rep), body weight dips max reps, abs
plus
30 minutes to an hour of out door activity in the fresh air (walking/jogging/mountain bike riding etc) every day seven days a week, plus as most of you are aware my gym is out doors as well, I think fresh air, sun and out door activity have a lot of benefits both physically and mentally.
Pretty basic but seems to keep me in shape and in the game while time is limited. If my goal was to compete in a body building comp and stand on stage in a g string while painted orange then my training would obviously be different. So each person has to make their own decision, but in a 'bang for buck' type routine isolation work has a very limited space IMO.