How does everyone get strong enough to pull 80-100 lbs easily to hunt Africa I'm currently at 75 lbs and pull it semi easy. At night time though it gets kinda hard to pull back. What's the best workouts to increase bow shoulder strength other than shooting a lot. Also I've been shooting shoot everyday for probably a month now is that too much?
Done properly! No such thing as shooting too much.
First: Why 80 to 100 pound draw weight?
Secondly:
Are you new to archery?
You didn't state how many shots you take before your fatigued. So I'm guessing you are relatively new or at least new to shooting a heavy weight bow.
Starting out shooting archery with a 75 pound bow is for multiple reasons a very big mistake.
In my younger days before compound bows have developed into today's high tech bows i eventually worked my way up to an 80 max pound York compound bow with 50% let off. Eventually, after shooting that heavy bow over 5 or 6 years I messed up my should muscles. Thankfully not my rotator cup. Three years later I could start shooting a 35 pound recurve bow again eventually working back up to a 70 pound bow after another 2 years and 2 compound bows later.
Start slow and easy then increase your draw weight 1/2 to 1 full rotation of the limb screw, about 2-1/2 t0 5 pounds, depending on your bow.
Pratice, Practice, Practice....
Drop your bow weight to its lowest draw weight!!
Then slowly increase your draw weight once you can comfortably shoot 30 consecutive arrows without a break, with greater than 75% going into the X, the other 25% in the X ring.
All you need to shoot is 5 arrows, then retrieve those arrows from your target. Most archers practice on 5 spot targets to save arrows. Myself I like to practice "Robin Hooding"; concentrating all my arrows into a one spot or X.
Take about a minute break between shots.
Take about a 5 minute or so break between 5 arrow set (that's including walking to retrieve your arrows, back to your line, and picking up your bow again.
Take a 15 minute or so break between every 5 sets (25 arrows).
A general practice session:
Stretch and flex your arms, shoulders and back muscles about 5 to 10 minutes.
Standing about 10 yards from your target take how ever many shots you need to feel comfortable but not over due yourself. If your body is fatigued after 10 to 20 shots; lower your draw weight.
Move to the 20 yard line.
"Lazily" As In No Hurry, shoot 5 arrows into your target and "Lazily" As In No Hurry, retrieve your arrows and return to your 20 yard line and repeat another 5 shots.
5 sets take a break
Next set and repeat, until you have shot 5 sets or 25 times (1 series). If you get fatigued why shooting a series lower your draw weight!
Take a 15 minute or so break.
Repeat until you have shot 3 series and done.
When, and Only When, you can consistently shoot a 3 series practice without being fatigued twice a day (ie morning and evening, roughly a minimumof 6 hours between series). Then increase your draw weight and repeat the forementioned practice session.
This will develop your muscles muscle memory, body positon (another subject), stamina, and accuracy. It can also help to prevent or at least delay a rotar cup/ any shoulder injuries.
Depending on the person:
1 practice series per day for a minimum of 3 weeks. Then 2 practice series per day. Then proceed to 30 yards, then 40 yards, then 50 yards, then 60 yards. I went as far out as 80 yards only because I couldn't go out any further at our local archery club. I haven't shot ASA tournaments in several years, so I don’t know if the ASA still has the 100 yards bison with the attached 1 inch exploding target.
A practice session should take about an hour to an hour and a half.
The slow pace, breaks, and such is to allow your muscles to decompress/relax/reduce fatigue.
Two more items:
1. Take your time: draw your bow, hold count to ten, and release. As you progress and the bow becomes easier to hold before increasing your draw weight, increase your hold time to 20, 30, 40, 50, 60, seconds.
2. After item 1: Practice randomly letting down and re drawing your bow on random shots once you are able to hold at full draw for 60 seconds.