How can I increase the strength of my Vault Dwellers?

I have a mission to increase five of the dweller's strength. It doesn't count if I just put armor on them that increases it. How do I increase strengh of Fallout Shelter?
Best Answer
If you open the build menu in the game, and scroll to the right, you'll see the Weight Room, which requires 24 Dwellers to unlock. You can assign Dwellers here and they will train, eventually increasing their strength. Each room after requires more Dwellers to unlock. There are additional rooms to train each of the SPECIAL stats:
- Weight Room :: Strength
- Armory :: Perception
- Athletics :: Endurance
- Lounge :: Charisma
- Classroom :: Intelligence
- Fitness :: Agility
- Game Room :: Luck
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How do you make your dwellers stronger?
E.g., a dweller with 1 in Strength will only take about 25 minutes to reach level 2, while someone with 6 will take 6+ hours to reach 7.How long does it take for dwellers to increase their strength?
Dwellers can raise their SPECIAL stats by spending time in various training rooms you can built in your Vault. Each training room focuses on training one specific SPECIAL stat. The higher stat is on a Dweller, the longer it will take to train and increase.How do you raise the special stats of a dweller?
Building a Weight Room allows your Dwellers in your Vault to train and increase their Strength over time....Training time can be affected by:How To Create Fallout Shelter's Strongest Dwellers: Vault Log #10
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Answer 2
I believe there is a weight room you unlock when you reach a certain number of settlers. You will need to build it and send your dwellers there.
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