I think very high frequency can work. look for eg. at gymnasts arms, mechanics forearms, speed cyclist legs these guys use or train pretty much the same muscles every day ~ sometimes multiple times a day - obviously food intake, genetics, drugs play a role too..
One thing is you have to drop back on other bodyparts when trying to bring a specific bodypart up.
I did this for back/lats as an experiment and it definitly works.
*Bought one of those pullup bars that fits in a normal door way.
Pull Up Lat Specialization Cycle
Week 1: 5 sets of 6 every day, at any time, spread out or together clustered, Total weekly volume: 210 reps Total daily volume: 30 reps
Week 2: 6 sets of 6 every day, at any time, spread out or together clustered, Total weekly volume: 252 reps Total daily volume: 36 reps
Week 3: 7 sets of 6 every day, at any time, spread out or together clustered, Total weekly volume: 294 reps Total daily volume: 42 reps
Week 4: 8 sets of 6 every day, at any time, spread out or together clustered, Total weekly volume: 336 reps Total daily volume: 48 reps
Week 5: 5 sets of 7 every day, at any time, spread out or together clustered, Total weekly volume: 245 reps Total daily volume: 35 reps
Week 6: 6 sets of 7 every day, at any time, spread out or together clustered, Total weekly volume: 294 reps Total daily volume: 42 reps
Week 7: 7 sets of 7 every day, at any time, spread out or together clustered, Total weekly volume: 343 reps Total daily volume: 49 reps
Week 8: 8 sets of 7 every day, at any time, spread out or together clustered, Total weekly volume: 392 reps Total daily volume: 56 reps
Week 9: 5 sets of 8 every day, at any time, spread out or together clustered, Total weekly volume: 280 reps Total daily volume: 40 reps
Week 10 : 6 sets of 8 every day, at any time, spread out or together clustered, Total weekly volume: 336 reps Total daily volume: 48 reps
Week 11: 7 sets of 8 every day, at any time, spread out or together clustered, Total weekly volume: 392 reps Total daily volume: 56 reps
Week 12 : 8 sets of 8 every day, at any time, spread out or together clustered, Total weekly volume: 448 reps Total daily volume: 64 reps
Week 13: 5 sets of 9 (On upper body days only) - 45
Week 14 : 6 sets of 9 (On upper body days only) - 54
Week 15: 7 sets of 9 (On upper body days only) - 63
Week 16 : 8 sets of 9 (On upper body days only) - 72
Week 17 : 9 sets of 9 (On upper body days only) - 81
Week 18: 5 sets of 10 (On upper body days only) - 50
Week 19 : 6 sets of 10 (On upper body days only) - 60
Week 20: 7 sets of 10 (On upper body days only) - 70
Week 21 : 8 sets of 10 (On upper body days only) - 80
Week 22 : 9 sets of 10 (On upper body days only) - 90
Week 23 : 10 sets of 10 (On upper body days only) - 100