Can I train every day if I vary muscle groups?
You can, but every day cannot be equally demanding forever. Varying muscle groups helps local recovery, but systemic fatigue, joints, sleep, time, and motivation still matter.
Daily training works best when intensity and volume are managed. Some days can be strenuous lifting, some can be easy cardio, mobility, skill work, or short accessory sessions. If every session is treated like a test, fatigue will catch up.
Ask whether daily training improves consistency and performance or simply satisfies restlessness. If performance is dropping and life feels crowded, fewer better sessions may be the stronger plan.