Trampoline is a good alternative to bed...for jumping. We bought one a few years ago and my youngest daughter still loves to jump on it.
I once dreamed of having an hour glass figure that could fit into a beautiful cheongsum perfectly. So, I bought myself a waist twisting disc. But I hardly used it and nowadays my maid is using it instead. She puts it in the kitchen and guess she must be burning off some calories while waiting for water to boil.
Apart from the waist twisting disc, my maid is also using my son's dumbbell to tone her arms. The kitchen has become her mini gym. Doesn't she already mop, scrub and and sweep a lot everyday?
When my son was in secondary 1, we gave him a doorway pull up bar. Initially he could only pull up once but he as gets older, he can do it better.
LIFT, STRETCH & PUSH UP
I am sure lots of teenage boys are concerned about their muscles. My son has requested for a heavier dumbbell last year (lighter ones are with his kakak now). His grandpa gave him an Ab Wheel (he is amazed with his grandpa who is still fit and able to do push up, no sweat!). And his uncle & aunty gave him a pair of PushUp Grisp on Christmas.
Not sure how frequent he does the work out..hopefully one day he will have good muscle tone. More importantly, I wish it will somehow improve his posture too (I always remind him not to slouch).