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perplexed - for starters try this 3 day every alternate day workout
muscle building process is 3 step process
1. Cause microscopic tear to muscle fibers
2. Heal it with proper nutrition
3. Prove rest
In the process of healing, the fibers gets stretched(this stretch will show as muscles) to get handle the stress for future assault on the musclegroups - so progressively you increase the weights(maybe after 4-5 weeks)
1. Biceps, forearms, upper back workout - day 1
if you have gym facilities
- rowing machine - 3 sets (10 reps each - if you can do more than 10 than that you are not in the range to gain muscle - so adjust the weights)
- lats pull down - 3 sets (10 reps again each)
- then maybe do isolation with dumbells or barbells (I would strongly suggest against isolation initially)
if no gym, look for a bar and try doing chin ups and pull ups and wide grip pulls - as much you can - you might be able to do only 1 initially but do not be deterred.
2. legs, glutes and abs - day 2
- squats with weights - form is very important else you will injure yourself - 3 sets - 10 reps each
- deadlifts - be careful with form - form is very important - 3 sets - 10 reps each
- and some machines to focus on glutes, hamstrings, quadriceps and calf
- abs -there are ab machines or bicycle kick is the best(lookup in the site I provided)
No gym, situps or something shown in the first few seconds of the flashdance movie (maniac song)
3. pectorals(chest) and triceps and shoulders(deltoids)
- incline bench press
- regular bench press
- dips
- military press in machine(I would recommend machine initially as free weights can hurt you here)
if no machines,
pushups - wide and diamond pushups - lots of them until you tire
rest for the remaining 2 days and as supplement add whey protein shake initially immediately after workout. As you say you are a hard gainer, take whey protein shakes 2 times and it will not hurt you. Increase your other proteins as well(like eggs, chicken etc)
You can make adjustments as you move forward to the workouts.