Edith Cowan University research revealed that muscle strength benefits are seen with consistent, short exercise sessions. Participants performing a three-second eccentric bicep contraction thrice weekly saw strength improvements. Daily 20-minute exercises might be more beneficial than a single 2-hour weekly session. Regularity, even in short durations, is key to health benefits.
What is energy restriction? That video is looong
Less energy in, so less kCal (I assume)
Yep!
Caloric restriction, or eating less calories than you burn off. Yeah, it is long, but it's a good watch.
TL;DW: eat less calories than you burn off, eat more protein, and lift weights or do calisthenics (body weight exercises like pushups, etc).
Thanks