Hmmmm...got a real sturdy coffee table? Couple of good ways to do jumps, but they all require some sort of sturdy platform or bench or two, about knee high.
Bench stradles: stand with legs on either side of bench. Jump up onto it, immediately going into a squat position. keep your knees soft.
Two Bench Squat jump: stand between two flat benches that are about 18 inches apart. Squat down, jump up with a leg on each bench, hold squat, then jump down. (really hard variation: 10 pulse squats before you jump, jump, 10 pulse squats on benches, jump down, repeat. ouch)
Single bench or platform: face platform and jump vertically onto it. (I step down- jumping down vertically is worse on knees than up.) Think "cat jumping onto mantle".
Jump squats with 180 degree turn on low platform or floor: put a mark on the floor or use a low (6") platform. Hold (unweighted) squat position for 1-2 seconds, then jump and turn 180 degrees, landing soft into squat position so that other foot is now on mark or platform. Repeat, turning in opposite direction. Progress to doing this with body bar over shoulders as long as you have NO spine or knee issues.
If you have real knee issues, don't jump at all.
Warning: If you haven't incorporated this type of training into your program and are not a runner, this will cripple you (butt and hammie) the first time
Mel