In short a being with Enhanced Strength is comparable to a champion weightlifter or strongman - capable of lifting the maximum weight possible in a "real world" scenario.
NOTE: a rare real-world example is included here to give an idea of the weight range we're talking about: Brit strongman Andy Bolton set the heaviest dead lift record when he lifted 457.5 kilograms from the floor to his thigh. The record for an overhead lift stands at 263.5 kilograms. - thus the maximum weight an Enhanced Human could lift would be roughly the same as this man, (who nears what we currently believe is "peak human" strength).
Items Which Grant This Ability
- Gluttuns (the entire species approaches "peak human" strength in comparison to average humanity)