Keeping up strength without access to weights for a month

[Anonymous]

Time under tension.

Do squats, but 3-5 seconds down + pulse at the bottom.

Things like that

[Anonymous]

If it were me, I'd pack my weights. Heather Robertson doesn't really require more than 5-10 pound weights. Even if flying, just put one weight per bag!
Otherwise, I agree with others - buy them at Walmart when you arrive. Worth it for 4 weeks!