It really depends on your discipline. Powerlifting really starts at 100kg of weight on a barbell, and many need more than 200kg of weight on a bar to perform their training. You could keep healthy with a home fitness regime, but you'll lose some of your total strength, and you certainly won't be progressing.

That's all I'm trying to point out, for many disciplines there is no substitute for equipment. But so be it, these are unique times.