Gym

The Gym is where you permanently improve the four combat stats used when fighting Zeds. Every individual training action costs 5 energy.

• Strength increases the damage you deal.
• Defense reduces the damage you receive.
• Speed improves your chance to hit.
• Agility improves your chance to dodge.

Training gains

Your gain from a training action depends on the stat being trained, its current base value, your Gym level, your current morale, and a small random variation. The four stats use different gain curves, so the same energy and morale will not necessarily produce the same numerical gain for each stat.

Gym level acts as a direct multiplier: level 1 gives ×1 gains, level 2 gives ×2, and so on up to ×10 at level 10. Active effects change the final combat value shown in the Gym, while training permanently increases the underlying base value. You cannot train while injured.

Morale boost

Morale improves Gym gains, but the effect varies with the stat and its current value. The Morale Boost shown in the game is an estimate for the next action; actual gains vary. Each action spends a random 4 or 5 morale when available, while training at zero morale receives no morale bonus.

Morale jumps

For a morale jump, players eat food items to stack morale above its normal maximum and use energy boosters to overstack energy, then spend both on a large training batch. Excess morale resets to the normal maximum at the next 15-minute clock boundary, so train before the on-screen countdown expires. The Gym only counts up to 9,999 morale when calculating gains.

Upgrades

Upgrade	Items required	Cash cost
Gym upgrade 2	100 × Logs; 10 × Nails; 20 × Iron Bar	$250
Gym upgrade 3	250 × Logs; 25 × Nails; 100 × Iron Bar	$500
Gym upgrade 4	250 × Logs; 50 × Nails; 250 × Iron Bar	$1,000
Gym upgrade 5	20 × Steel; 10 × Wire; 1 × Rope	$25,000
Gym upgrade 6	100 × Steel; 20 × Wire; 2 × Rope	$50,000
Gym upgrade 7	250 × Steel; 30 × Wire; 10 × Rope	$100,000
Gym upgrade 8	10 × Brick; 20 × Cement; 10 × Plastic	$250,000
Gym upgrade 9	25 × Brick; 50 × Cement; 20 × Plastic	$500,000
Gym upgrade 10	50 × Brick; 100 × Cement; 40 × Plastic	$1,000,000