Why does it only offer certain weights?

Next Lift only suggests weights you can actually build from the plates you own, loaded evenly on both sides. If a number can't be made, it tells you instead of letting you plan something you can't load.

For example if you have a 20kg bar, 2x 10kg weight plates, and 2x 5kg weight plates then you will be able to log:

• 20kg (bar only)
• 30kg (bar 20kg + 2x 5kg)
• 40kg (bar 20kg + 2x 10kg)
• 50kg (bar 20kg + 2x 10kg + 2x 5kg)

It will _not_ let you select 45kg, as this isn't loadable with even plates on each side.