How many kilos do you lift?
Stress 'sol-LE-vi'. 'Chili' = KEE-lee — plural of 'chilo' (kilogram).
Use this informally with other gym-goers when curious about their training load, or to calibrate your own starting weight when using a machine someone else just vacated.
'Quanti' = how many (masculine plural). 'Chili' = kilograms. 'Sollevi' = you lift (from 'sollevare', informal 'tu' form). In weight training, 'sollevare' is the standard verb. You can also say 'carichi' (loads) instead of 'chili'.
Con quanto peso stai lavorando?
What weight are you working with?
Alternative phrasing.
Quale peso mi consigli per iniziare?
What weight do you recommend I start with?
Asking for advice.
Posso togliere qualche disco?
Can I remove some weight plates?
When the bar is too heavy.
The 'panca piana' (flat bench press) is culturally iconic in Italian gyms, much as in many Western countries. 'Quanto carichi in panca?' is a common icebreaker between male gym-goers. Italian gym culture celebrates consistent progress ('progressione') over raw numbers.